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- 1.. 4. Which starting material is the limiting reagent in this procedure? Which reagent is used in excess? How great is the molar excess (how many times greater)? Isopenyl alcohol: 1mL Acetic acid: 1.5 mLTaking Ka for acidic acid as 1.8 x 10-5, calculate H3O+ , using the known concentraions of acidic acid and soudium acecate contained in reaction mixtures 1 and 4. Reaction mixture time (s) Acidic acid concentration (mol/L) sodium acetate concentration (mol/L) calculated H3O+ concentration 1 237 0 1 x 10 -5 4 236 1 x 10 -4 1 x 10 -5Base from the illustration: 1. Which compound/s will test positive in Baeyer’s test? 2. Which compound/s will produce an orange precipitate upon reaction with 2,4-DNPH? 3. Which compound/s will test positive in the Iodoform test? 4. Which compound/s will produce a brick-red precipitate upon reaction with Fehling’s reagent (CuSO4, tartrate, NaOH)? 5.
- E. TESTS FOR PHENOLIC COMPOUNDSPhenolic compounds such as phenol, salicylic acid, etc., give characteristiccolors with FeCl3 and Millon’s Reagent.1. Ferric Chloride TestAdd 5 drops of FeCl3 solution to 4 different test tubes containing 1 mL each ofdilute solutions of the following compounds and note the color obtained.a. Phenol _______________________________________________________________b. Salicyclic acid ___________________________________________________________c. Resorcinol _______________________________________________________________d. Picric acid _______________________________________________________________2. Millon’s TestPrepare another set of 4 test tubes containing 1 mL each of the solutions listedbelow. Add 3 drops of Millon’s reagent to each and place all the test tubes in aboiling water bath. Note the color formed.a. Phenol _______________________________________________________________b. Salicylic acid ___________________________________________________________c.…True or False1. When FeCl3 is used in visualizing aspirin in thin layer chromatography, the resulting spot is red in color 2. Chlorination of phenol occurs even if the reagent AlCl3 is missing3. The molecule 2,4,6-trinitrophenol, being a phenolic compound, tests positive for the FeCl3 testWilliamson Ether Synthesis lab. What is the limiting reagent? I used 160 micro liters p-cresol. 260 microliters NaOH, 0.019g tetrabutylammonium bromide and 150 microliters 1-iodopropane
- Give the reagents and results/observation (ex. color) Test for aldehydesa. Schiff’s testb. Formalinc. Acetoned. Benzaldehydee. AcetophenoneMelting 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.(a)Which compound/s will produce an orange precipitate upon reaction with 2,4-DNPH? (b)Which compound/s will test positive towards Baeyer’s test? (c)Which compound/s will produce a brick-red precipitate upon reaction with Fehling’s reagent (CuSO4, tartrate, NaOH)? (d)Which compound/s will test positive towards the Iodoform test?