In a few sentences summarize your results for odor, solubility, acidity and the FeCl3 test for the knowns. Ethanol 2-Propanol t-Butanol Cyclohexanol Phenol
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In a few sentences summarize your results for odor, solubility, acidity and the FeCl3 test for the knowns.
Ethanol
2-Propanol
t-Butanol
Cyclohexanol
Phenol
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- In a few sentences summarize your results for odor, solubility, acidity and the FeCl3 test for the knowns. Ethanol 2-Propanol t-Butanol CyclohexanolMelting point range Recrystallized Phenacetin 95-100 Recrystallized Phenacetin + Reference Phenacetin 110-115 Recrystallized Benzil 92-95 Recrystallized Benzil + Reference Benzil 94-98 Questions: 1. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of mixed melting point. 2. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of melting point. 3. What are two characteristics of a good recrystallization solvent for a given compound? 4. Given a solid sample that contains impurities, how would you determine which solvent to use for a recrystallization? Describe how you would do this in the laboratory. 5. Clearly explain the difference between a recrystallization and a precipitation.What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & III
- Will the melting point increase or decrease with the benzoic acid, 4-chloroanaline, and naphthalene if : -You do not remove all of the HCl from the first extraction (mixture) -You forget to do the NaOH extraction (aq layer) -You do not rotovap all of the solvent in the final step (organic layer)Which of the following observations is INCORRECT? a. 4-aminophenol: wine red solution in FeCl3 b. Phenol: white precipitate in Br2 in water c. 3,5-dimethyl-1-hexanol: No layer formation in Lucas reagent d. 3,6-dihydroxycycloheptanone: decolorization of solution in KMnO4 testthe eugenol and water distillate you collect is apt to be cloudy, particularly the first part of this distillate. Explain why.
- (extraction, reactive extraction, recrystallization). Write a few sentences for each technique explaining themORANGE II SYNTHESIS Describe the recrystallization process of the Orange II dye in 95% ethanol. (List the procedures)1. The reactant (2-methyl-2-butanol) has a limited solubility in water at room temperature. 10.0 mL of 2-methyl-2-butanol will dissolve in ~ 80 mL of water. In this experiment, 10.0 mL of 2-methyl-2-butanol readily dissolved in 20 mL of 12 mol/L aqueous HCl. a. Why does this compound exhibit some solubility in water? Consider intermolecular forces and include a diagram to illustrate the relevant intermolecular forces. Why is it not completely miscible in water (in all proportions)?
- 1. What type of reaction explains solubility of phenol in sodium hydroxide? Explain the organic product formed. 2. How do the reactions of phenol samples with FeCl3 compare? Which structural component of the phenols account for the observationCould you simply explain how to alter the solubility of organic bases using extraction? How do you alter the solubility of organic acids using extraction?Your employer hands you a heterogeneous mixture and asks you to isolate all of thehexane that you can from it. After some analysis, you determine that the mixture contains toluene, hexane,benzoic acid, water, sodium chloride, and sand. Explain how you would isolate pure hexane from thismixture. Remember that you can use techniques such as filtration, extractions, and acid/base chemistrythat we learned earlier in this course in addition to distillation. You may need to look up solubilities and/orboiling points online to solve this problem. You only need to isolate the hexane?
