melting point of impure sulfanilamidemelting point of impure sulfanilamide

the impure sulfanilamide and the total weight is very similar in mass because the impurity hexane C 6 H 14 Remove contaminated clothing and wash before reuse. On May 18, 1909, Deutsches Reich Patentschrift number 226,239 for sulfanilamide was awarded to Heinrich Hrlein of the Bayer corporation. MSDS Name: Sulfanilamide Catalog Numbers: AC132850000, AC132855000, 13285-1000, O4525-100 Synonyms: 4-Aminobenzenesulfonamide. Also, compare these to the literature value. Compound B will continue to dissolve in the melt, until it reaches the eutectic composition (point a in Figure 6.7b), and the system will continue to melt at this composition until the entirety of the minor component (the impurity) is dissolved. Sulfanilamide Melting point standard, pharmaceutical secondary standard; traceable to USP; CAS Number: 63-74-1; EC Number: 200-563-4; Synonyms: p-Aminobenzenesulfonamide; Linear Formula: H2NC6H4SO2NH2; find Supelco-02344 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich The melting point of a sample is usually expressed as two numbers called the melting point range, such as 112 - 114C. nwC0\a`qPi+^9o}'w^OX"nlngH5wCF-?n&Tmc5{9 Unknown C (0 g) + O Urea Water or Hexane NH 2 O H 2 N 5. Melting point : 165 - 166 C : Freezing point : No data available : Boiling point : No data available : Flash point : No data available : Auto-ignition temperature : No data available : When melting point ranges were compared, it was assumed that unknown C Question: What should the melting points be for impure and pure sulfanilamide and impure and pure fluorene? recovered. The contrast in solubility at cold and warm temperatures is vital in the crystallization method. being left behind in the mother liquor and others were due to the use of too much solvent in Chemically, it is an organic compound consisting of an aniline derivatized with a sulfonamide group. for the crystallization of an impure sample of or. Ranges of Pure and Impure Samples of Sulfanilamide. Is your sample impure, or did you heat too fast? In this problem, a solid is given with two possible solvents for crystallizing the impure solid. Thanks for contributing an answer to Chemistry Stack Exchange! . However, the melting point of impure sulfanilamide may be different due to the presence of impurities. While the pure sample lied within the primary In part A, 0 g of impure sulfanilamide was crystallized and a pure sample of Ref: Hansch,C et al. Answers/Comments are in blue ink. melting point technique was utilized to identify an unknown solid. It has a max of 255 and 312nm. at the same time. Experiment Crystallization - Crystallization Purpose: in this - StuDocu By comparing the solubility of impure fluorene in the 3 solvents in room temperature and in a hot water bath, the best solvent for the crystallization of impure fluorene was identified as methanol. Acetylsalicylic Acid (0 g) 122. I need help on the last 3 pages. The first number is the temperature at which the substance begins to melt (when liquid is first observed) and the second number is the temperature at which the sample has completely melted (no solid left). My point is you actually WANT the ice to melt into a salt solution, because that will better cool the churn - as long as there's enough salt so that the liquid is cold enough. You will crystallize a sample of impure sulfanilamide by dissolving it in the minimum amount of boiling 95% ethyl alcohol (78 C) and then cooling the solution, first to room temperature, and then to 0 C in an ice-water bath. Replacing broken pins/legs on a DIP IC package. See attached for full solution and proper format. https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_Lab_Techniques_(Nichols)/06%3A_Miscellaneous_Techniques/6.01%3A_Melting_Point/6.1C%3A__Melting_Point_Theory, We've added a "Necessary cookies only" option to the cookie consent popup. the measurement of the melting points of the pure and impure samples of sulfanilamide. point So that solute is properly dissolved in the hot solvent. Melting Point for Known Compounds Explanation of melting and boiling point deviations Characteristic Properties - Melting and Boiling Points Crystallization of Impure Sulfanilamide using 95% Ethyl Alcohol Hypothesis Testing NMR Spectrum of Caffeine and Vapor Pressure of Sublimation Ranking Compounds by Expected Melting Points Then we will use an stream Mass of watch glass g 48. "R}~Q:~pgg'"l/O:OV~ @zo7g;)K;=d'}z8}7w7?Iuw?w~ikK^^'d4k;g_u_LOC6($uiz["Dw#d"egHf_O=4D~PD<.O3@MG_2)QZ>f.to_wv~} Water is a polar solvent so it will not dissolve fluorene even at a Through the crystallization of impure sulfanilamide and fluorene, pure sulfanilamide and fluorene was recovered. 5 0 obj The melting point decreases the further the composition is from purity, toward the middle of the graph. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. solvent mixture) and cooling the solution slowly. which signifies the presence of impurities within the mixture. Some sources of sample loss of the sulfanilamide Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. For any problem, leave comment. dissolve in polar solvent like water while non polar compounds will dissolve in nonpolar As solids are restricted in atomic motion, there is little difference in entropy between a pure and impure solid. irritant, Diethyl ether (C 2 H 5 ) 2 O The melting point of pure sulfanilamide is around 303-305C. The breadth of an experimentally determined melting point can often be correlated to the purity of the solid. utilized to verify the purity of the final material. Listed below are solubility-vs-temperature data for an organic substance A dissolved in water. A droplet of liquid is not seen until approximately \(10\)-\(20\%\) of the sample has melted. pure than the impure sample, but it is not certain whether it is 100% pure sulfanilamide. Meaning a polar compound will An impure solid is typically heterogeneous on the microscopic level, with pure regions of each component distributed through the bulk solid much like granite. Impurities can be introduced into the compound during its synthesis or during its handling and storage. A more impure solid may first visibly melt at perhaps point d in Figure 6.9b, to give a broader melting range (between points d and e). \(\Delta G^\text{o}\) is dependent on both the changes in enthalpy \(\left( \Delta H^\text{o} \right)\) and entropy \(\left( \Delta S^\text{o} \right)\) during the process (see versions of the Gibbs free energy equation in Figure 6.8b), but the changes in enthalpy are similar when melting a pure and impure solid as similar intermolecular forces are broken. Sulfanilamide is a sulfa drug which is, also the first generation of antibiotics, used to treat many diseases. Therefore, by process of elimination, unknown C was identified as benzoin. Why do many companies reject expired SSL certificates as bugs in bug bounties? *:&E1R!f>'Q|86Kg-WmtRokv#WW( C13UpC `lbSDjY6H^'FM"q\UWn ]^V;SAO7(.S$M'"2~ 9CU20 xJe[]~ cyI+4O&2lleq %6'e"'n6 ,gquxOtL$ur :7$mPYV.!o-LIR%V9u1mH ajcGUy0> p-%zDr5#&SA4j8^"\%Qu8S$we~nsC_\w5,+fcrgi-$yu Do I need a thermal expansion tank if I already have a pressure tank? Also, compare these to the literature value. The temperature is then slowly increased until the compound melts. While the pure sample lied within the primary melting range of sulfanilamide, there was a depression in the melting range of the impure sample because impurities disrupted the crystal lattice energies. sulfanilamide and fluorene. crystal is formed initially, and it then grows layer by layer in a reversible manner. soluble in methyl alcohol at room temperature but is going to be soluble if that Acetaminophen is moderately polar meaning it is soluble in ethanol, poorly soluble in a. L\a&x="WK9G !BxaOh;n^/]x\y1"A,i`PtO 1gPL|P(ytqiCV+Q$n You want the temperature of the liquid water to be lower. It is important to accurately determine the melting point of a compound, especially in the pharmaceutical industry, to ensure the safety and effectiveness of the final product. Specifically in this experiment, the temperature was adjusted to affect the solubility. is a hazard so this is a concern. A sufficient change in temperature that ultimately Sulfanilamide is a sulfa drug which is was either acetylsalicylic acid, with the melting point ranges of 138 to 140, or benzoin, with For example, if the melting point of a sample of sulfanilamide is significantly lower than the known melting point of pure sulfanilamide, it is likely that the sample is impure. Observations: 2A: The purified crystals of sulfanilamide were in the shape of needles, white, and slightly translucent. hazard At the option of the instructor, turn in your crystallized material in a properly labeled container, Preparations. Question: What should the melting points be for impure and pure - Chegg Therefore, mixtures with compositions near the eutectic composition also give a sharp melting range, even though they may be far from pure. Because of this latter factor, some sulfanilamide will remain dissolved in the mother liquor (the liquid remaining after crystallization has taken place). Une chimie qui gurit: Histoire de la dcouverte des sulfamides. The first 5 pages are background explanation. PABA can also reverse the effects of sulfonamides. The melting point of the solid from the mother liquid was 162 -165, which is not the same as the crystallized material because the solid from the mother liquid . A. celsius, which was lower than the melting point of the crystallized (pure) sulfanilamide The pure sample had a melting range of 162.9 C to 165.8 C while the impure sample had a melting range of 160.3 C to 163.2 C as shown in Table 1. This increases the purity of the melt, so the melting temperature increases somewhat. Part B: Table 3. 2A)1 Color of impure sulfanilamide: yellowish whitish powder-Color of pure sulfanilamid View the full answer Transcribed image text: 1. Melting point depression is the reason why adding salt to frozen streets helps to melt the ice. Determine the melting point for number 1 and number 2 of 2b Show transcribed image text Expert Answer Transcribed image text: 1. Mass of watch glass (g) 48. In part C, the melting point range of unknown C was compared to the melting points of various compounds shown in Table 6. The literature melting point of sulfanilamide is 164.5 - 166.5C. literature value. In Part B, we will be 114cY uKG'G*7:~u9>Zi`= t8$DeBo=jy6gL*rlfgQW^-R'(k`e-sX~@:k/0'ES2\n4 The purity of the sample collected at the end of crystallization was confirmed through the measurement of the melting points of the pure and impure samples of sulfanilamide. On the other hand, the solubility of a Recrystallization and Melting Point Determination Lab Adam Cap Then we will use an, experimental procedure for determining which one of three possible solvents is the most. Sulfanilamide 163-166 Succinic acid 184-185 It is for these reasons that a low melting range \(\left( < 2^\text{o} \text{C} \right)\) is associated with purity, although it is also possible that the solid's composition could be coincidentally near a eutectic point. The melting point of pure sulfanilamide is around 303-305C. For example, a solid that is 20 % compound A and 80 % compound B would have a final melting temperature of point c in Figure 6.7b. I guess I should point out that you need to consider walking over hot rocks vs walking in say an inch of water at the same temperature. the process of dissolving the solid with heat because the solid compounds have a higher For most substances, the If not, there was a depression in the melting point of The recorded melting range for this system would be at the maximum between temperatures a and c, but if the first droplet is seen at point b, the recorded melting range would be between temperatures b and c. A melting point is a useful indicator of purity as there is a general lowering and broadening of the melting range as impurities increase. The purity of the final material after crystallization will be determined by observing the color of your crystals and by performing a melting point on your sample. On the other hand, impure sample of fluorene had a melting range of 110C to Based on the melting point of the crystallized sulfanilamide, it is more A sufficient change in temperature that ultimately lowered the solubility allowed the formation of the crystalline solid in this experiment. Domagk was awarded the Nobel Prize for his work. melting range of sulfanilamide, there was a depression in the melting range of the impure higher than room temperature then it will be able to completely dissolve the substances. Impurities can be introduced into the compound during its synthesis or during its handling and storage. K vOJhCP4EMLpR6;-d B4w%j+KIYch6Xu,K9RBS]h^$ !2zh`4@. *~`&>C7&i3!fTm0~NrW$!DbG__kdN/{OI@({`?9I/9 Qo! pdf, Applying the Scientific Method - Pillbug Experiment, Leadership class , week 3 executive summary, I am doing my essay on the Ted Talk titaled How One Photo Captured a Humanitie Crisis https, School-Plan - School Plan of San Juan Integrated School, SEC-502-RS-Dispositions Self-Assessment Survey T3 (1), Techniques DE Separation ET Analyse EN Biochimi 1. Melting Ranges of Unknown C Compound Melting Range C Unknown C 138- Unknown C 0 g + Acetylsalicylic Acid 0 g 122. Some of the deductions in the percentage of recovery were due to the impurities In part B, by comparing the solubility of impure fluorene in the 3 solvents in room temperature and in a hot water bath, the best solvent for the crystallization of impure fluorene was identified as methanol, as shown in Table 3, because fluorene was only partially soluble in methanol in room temperature and completely soluble in methanol at a higher temperature. Econ 1 - Chapter 1 Questions and Answers. The literature provides a melting point of 122 C for benzoic acid, which falls in this experimental range. When a compound is impure, the presence of impurities disrupts the repeating pattern of the molecules, resulting in weaker intermolecular forces and a lower melting point. 6 0 obj endobj Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. If the eutectic composition is, for example, \(40\%\) A/\(60\%\) B, and the solid's composition is \(45\%\) A/\(55\%\) B, nearly all of the impure solid will melt before the melting temperature will change from the eutectic temperature in the phase diagram. The purity of the pure sample was also confirmed using the melting point technique. For most substances, the solubility increases with increasing temperature. Chem 331 Lab Practical 1 Questions Flashcards | Quizlet Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. YuaoJ; ?,:kEC)61_\C4%kQ?(- YK'] The melting point of the solid from the mother liquid was 162 -165, which is not the same as the crystallized material because the solid from the mother liquid may have traces of impurity which accounts for the melting point depression. crystallization of impure sulfanilamide and fluorene, pure sulfanilamide and fluorene was, recovered. Results 3 pts o Results sheet neatly filled out with data o Proper significant figures o Legible calculation of percent recovery - 2. When working with organic compounds in a lab, the purity of the compound can be partially determined through the use of a precise measurement of the melting point. compounds that melt over a wide range are assumed to be relatively impure. Therefore, 95% ethyl alcohol is an excellent solvent for crystallizing sulfanilamide. Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01. We are expected to, find the appropriate solvent for crystallization and then perform it on the fluorine sample, given in the lab manual. The solid must be heated to a certain temperature in order for this structure to be disrupted and for the solid to melt. The melting point is the temperature where the solid and liquid phases are in equilibrium with each other, and the change in free energy \(\left( \Delta G^\text{o} \right)\) for the process (solid \(\rightleftharpoons\) liquid) is zero. utilized to verify the purity of the final material. It has a max of 255 and 312 nm. Expert Answer Melting point of impure sulfanilamide is lower than melting point of pure sulfa View the full answer As a result, the compound melts at a lower temperature. This continues until the entire sample is melted. the pure sample extracted from crystallization was pure, the melting point of the sample lied The lines mark the solid-liquid transition temperature (melting points). Freezing/Melting Point:163 - 167 deg C Decomposition Temperature:Not available. irritant. An impure substance cannot have a definite melting point, as it depends on the degree of impurity. ethanol. It has a density of 1.08 g/cm3 and a melting point of 164.5-166.5C. 386 148 Low [5][12][11], Sulfanilamide was first prepared in 1908 by the Austrian chemist Paul Josef Jakob Gelmo (18791961)[13][14] as part of his dissertation for a doctoral degree from the Technische Hochschule of Vienna. The solution prepared in a is cooled. With prior knowledge of the fact that like dissolves like. Market-Research - A market research for Lemon Juice and Shake. The furthest left side of the graph represents a sample that is pure compound "A," while the furthest right side of the graph represents a sample of pure compound "B." This creates strong intermolecular forces, which give the compound a high melting point. At the eutectic point, what is the effect on the melting point of adding impurities? The three solvents will illustrate three very different solubility behaviors: initially existent in the compound in the mother liquor, to ultimately yield relatively pure. Separately, add ~6 mL of 95% ethanol and your magnetic spin bar to your 50-mL Erlenmeyer flask. Therefore ethyl alcohol since they have similar polarities. The solid will continue melting until perhaps point c in Figure 6.9a, to give a relatively narrow melting range (between points b and c). 163-164 C. Connect and share knowledge within a single location that is structured and easy to search. Mammals do not synthesize their own folic acid so are unaffected by PABA inhibitors, which selectively kill bacteria. This question can be answered by referring to the guidelines for predicting polarity and solubility behavior (see Lab #3, Solubility). acid, 138 C to 140C. Melting Points. The melting point of ice decreases from 0 C to -22 C on mixing salt in it in proper proportion. /Producer(Sub Systems, Inc.)/CreationDate(D:20211226234727+05'00')/ModDate(D:20211226234727+05'00')/Creator(Sub Systems, Inc.) The first part of the experiment is the recrystallization of impure acetanilide. This page titled 6.1C: Melting Point Theory is shared under a CC BY-NC-ND 4.0 license and was authored, remixed, and/or curated by Lisa Nichols via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request. be 122 C as shown in Table 7. affinity for molecules of its own kind than for the impurities, they leave behind the impurities state, it will be converted into a solid crystalline state. which is higher than the melting point of the solute fluorenol (153-154 oC). The literature melting point for pure sulfanilamide is 163C -164C. Most solids, such as ice, form as crystalline lattices of repeating ions or molecules. Benzyl alcohol is not the right choice for the solvent since it's boiling point is 205oC, Biphenyl is very similar in structure to benzene and has very similar polarities. However, the presence of impurities weakens the lattice, making it less stable. ncdu: What's going on with this second size column? How can this new ban on drag possibly be considered constitutional? How can sodium chloride melt ice or keep it frozen? Substance of higher latent heat of melting than water, similar melting point, Effect of inductive effect on boiling point,melting point and dipole movement. Part C: Table 6. In many mixtures, the minimum melting temperature for a mixture occurs at a certain composition of components, and is called the eutectic point (Figure 6.7a). Mass of impure fluorene (g) 0. (a) Fluorenone (the "impurity" added to both the sulfanilamide and the fluorene) has a melting point of 84 C. However, the melting point of impure sulfanilamide may be different due to the presence of impurities. Avoid contact with skin and eyes. consists of two covalently attached benzene rings, and as a result we closely resemble the material which appeared more clear. Initial Observations Impure sulfanilamide had ayellow/white color The reason is that contaminations weaken the lattice forces within a solid crystalline sample. may have been to some of the product still being soluble in the solvent, even in the ice given in the lab manual. Percent Recovery 62% Melting Point Range of Pure Sample C 116-117. Of that sample, 0.1 grams will be saved for a melting point determination. I have also typed in red where I need help. We put them into a churn (which is just a small bucket with a mixing blade in it so you could hand mix the contents) and then added ice around the churn (outside the churn) to cool it down. This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here! water, crystallisable in ethyl alcohol. In this experiment, you will carry out a crystallization of impure sulfanilamide using 95% ethyl alcohol as the solvent. The melting points of the pure compounds were lower than the melting points of the impure substances. Thus ice problem when driving is solved (aside from the environmental concern of all the heavy salts). << /Length 11 0 R /Type /XObject /Subtype /Image /Width 378 /Height 484 /Interpolate Physical and chemical properties Physical State Solid Appearance Off-white Odor Odorless Odor Threshold No information available pH 5.8-6.1 0.5% aq. When \(10\)-\(20\%\) of solid has melted and a droplet is visible, the system may have progressed far from the eutectic composition (perhaps to begin visibly melting at point b in Figure 6.9a). In a second, solvent, fluorene will be highly soluble, even at room temperature. In this case pure water at this temperature will be in the solid phase and exist as ice because the surrounding temperature is lower than the melting/freezing point. Acetylsalicylic Acid 138-. PDF Sulfanilamide Specificall, experiment, the temperature was adjusted to af, solubility increases with increasing temperature. The dissolved material has a decreased of various compounds shown in Table 6. The paragraph is therefore a tad confusing. [1] Powdered sulfanilamide was used by the Allies in World War II to reduce infection rates and contributed to a dramatic reduction in mortality rates compared to previous wars. Clothing: Wear appropriate protective clothing to prevent skin exposure. As compound B is dissolved into the melt (causing it to become more impure), the freezing point of this mixture is depressed. solubility at lower temperatures and will separate from the solution as it is cooled. 0 g was collected, with a 69% recovery of sulfanilamide as shown in Table 1. In a melting point analysis, the solid is a mixture rather than a pure substance. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What sort of strategies would a medieval military use against a fantasy giant? flammable, O-toluic acid (CH 3 )C 6 H 4 ( 86 -95 Flamma crystals. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. experimental procedure for determining which one of three possible solvents is the most MathJax reference. For both cases, the change in melting point has to do with homogeneous mixing in the liquid state, though, according to Lisa Nichols: An impure solid is typically heterogeneous on the microscopic level, with pure regions of each component distributed through the bulk solid much like granite. Can I tell police to wait and call a lawyer when served with a search warrant? If unknown C was acetylsalicylic acid, then the melting point of the mixture should have been relatively close to the melting range of acetylsalicylic acid, 138 C to 140C. This microscopic melting is not visible to the eye. The pH of a 0.5% aqueous solution of Sulfanilamide is 5.8 to 6.1. Legal. Depending on the quantity of impurity, the system may have progressed far from the eutectic temperature (perhaps to point b in Figure 6.7b) before liquid becomes visible to the eye. But there was a problem. Skin: Wear appropriate protective gloves to prevent skin exposure. It has a density of 1.08 g/cm 3 and a melting point of 164.5-166.5 C. Sulfanilamide (also spelled sulphanilamide) is a sulfonamide antibacterial drug. This microscopic melting is not visible to the eye. In addition, the best solvent for recrystallizing an unknown solid will be determined and identified . Market-Research - A market research for Lemon Juice and Shake. Create three research questions that would be appropriate for a historical analysis essay, keeping in mind the characteristics of a critical r, Carbon Cycle Simulation and Exploration Virtual Gizmos - 3208158, 1.1 Functions and Continuity full solutions. had a melting range of 162 C to 165 C while the impure sample had a melting range of hazard, 99 126 Irritant, What is the melting point of impure sulfanilamide? - Answers rev2023.3.3.43278. Lesson 8 Faults, Plate Boundaries, and Earthquakes, Copy Of Magnetism Notes For Physics Academy Lab of Magnetism For 11th Grade, Chapter 02 Human Resource Strategy and Planning, Week 1 short reply - question 6 If you had to write a paper on Title IX, what would you like to know more about? Melting of an impure solid into an impure liquid therefore has a larger change in entropy than melting a pure solid into a pure liquid (Figure 6.8a). Similarly, it will be problematic if the compound is completely soluble in the solvent at room temperature because it will be difficult to crystallize the compound later on in the crystallization process. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. irritant; temperature is raised. In order for the ice to melt it needs heat. Some of the deductions in the percentage of recovery were due to the impurities being left behind in the mother liquor and others were due to the use of too much solvent in the process of dissolving the solid with heat because the solid compounds have a higher affinity for the solvent at a higher temperature. The melting point of the impure sulfanilamide was 165. Compound Melting Range (C) Retrieved 3 October 2021. We know that fluorene is non-polar so as like dissolves like it will be 5 - 166. Melting point of impure sulfanilamide. Crystallization of Impure Percent Recovery of Pure Fluorene through Crystallization and Melting Ranges of Modern antibiotics have supplanted sulfanilamide on the battlefield; however, sulfanilamide remains in use today in the form of topical preparations, primarily for treatment of vaginal yeast infections mainly vulvovaginitis which is caused by Candida albicans.[4][5][6][7]. In 1938, the Food, Drug and Cosmetic Act was passed. Methyl alcohol has both polar and nonpolar parts so fluorene is not Determine the melting point of the pure sulfanilamide and the original impure material. sol Melting Point/Range 163 - 167 C / 325.4 - 332.6 F Boiling Point/Range No information available Flash Point No information available Specifically in this Melting of a pure solid occurs at a higher temperature than melting of an impure solid, a concept called melting point depression (or freezing point depression). Percent Recovery 62% Melting Point Range of Pure Sample C 116-117. This new feature enables different reading modes for our document viewer.By default we've enabled the "Distraction-Free" mode, but you can change it back to "Regular", using this dropdown. By comparing the solubility of impure fluorene in the 3 solvents in room temperature and in a hot water bath, the best solvent for the crystallization of impure fluorene was identified as methanol. In part C, the melting point range of unknown C was compared to the melting points of various compounds shown in Table 6. appropriate. If the melting point is within the scientifically accepted range of the material's melting temperature, then the material is presumed to be pure. sulfanilamide using a known solvent, 95% ethyl alcohol, and melting point technique was

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