When 0.100 g of an unkown polyhydroxy organic substance was added to 50.0mL of phenol, a decrease of 0.750 C was observed. What is the molecular weight of the polyhydroxy organic compound?
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- When 0.100 g of an unknown polyhydroxy organic substance was added to 50.0 mL of phenol, a decrease of 0.75 0C was observed. What is the molecular weight of the polyhydroxy organic compound?In preparation of p-Nitroaniline, Starting material is 50g of p-nitroacetanilide, 22ml of HCI, 20g of p-nitroaniline. Give % yield of nitro acetanilide.Write the esterification reaction of acetic acid with isopentyl alcohol to form isopentyl acetate and acetic acid. What is the theortical yield of isopentyl acetate and which one is the liniting reagent? Moles of acetic anhydride= 0.023mol Volume of acetic anhydride= 2.2ml Molar mass of acetic anhydride= 102.09g/mol Volume of isopentyl acetate = 2ml Molar mass of isopentyl acetate = 88.148g/mol Density of isopentyl acetate = 0.81g/mL Mass of isopentyl acetate (Actual yield)= 1.887g
- Benzoic acid was synthesized by carbonating a Grignard reagent. In a first step, 8.0 grams of dry magnesium shavings and a small iodine crystal, 15.0 grams of bromobenzene and 20 mL of dry ether are mixed. After gentle heating, the iodine decolorized, which was a sign that the Grignard reagent C 6 H 5 MgBr had been formed. After the Grignard reagent is separated, it is allowed to react with carbon dioxide (CO 2 (s)) and excess dilute hydrochloric acid (forming benzoic acid and MgClBr). Benzoic acid formed is transferred to the anion form by addition of NaOH and the organic and aqueous phases are separated. Benzoic acid (C 6 H 5 COOH (s))extracted by precipitation from the water phase, including hydrochloric acid and subsequent filtration. Recrystallized precipitate weighs 6.36 grams. Write the reaction formula and calculate the yieldA Student added 1.5 ml of 3 M Methyl Magnesium Bromide to a conical vial containing Benzophenone & diethyl ether, after 30 minutes he added dilute sulfuric acid and isolated the product. Identify the Major product. a) b) c) d)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.…
- Assume that 2 mL of aniline and 3 mL of acetic anhydride are used in the preparation of acetanilide. What is the percentage yield if 2.2 g of acetanilide is obtained?In the Synthesis of p-Nitroaniline, a 100 gram of acetanilide, 1mL of sulfuric acid and 0.5 mL of nitric acid. Give % yield of acetanilide.Propose a method to separate a mixture containing phenol, benzoic acid, naphthalene, and p-nitroaniline. Phenol is soluble in sodium hydroxide solution but insoluble in neutral water or sodium bicarbonate solution. Benzoic acid is soluble in either sodium hydroxide or sodium bicarbonate solutions. Write out the structures of the molecules in your scheme.
- 1. What type of reaction explains the 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 observation? 3. What compound is the precipitate formed in the Bromine water test? 4. Write the reaction formed in the formation of phenolphthalein. Identify the functional group in phenolphthalein , which is responsible for the indicator property. 5. What is the significance of Millon's test?Eugenol is a natural product derived from the dried flower buds of the evergreentree, Eugenia aromatica. Briefly describe a procedure with reagents required toextract eugenol as a single component from the mixture of compounds presentin these flower buds.Show how you would use extractions with a separatory funnel to separate a mixture of the following compounds: benzoicacid, phenol, benzyl alcohol, aniline