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FIND PERCENT YIELD OF BENZOIN

FIND PERCENT YIELD OF BENZOIN

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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FIND PERCENT YIELD OF BENZOIN

Experiment 9A: Coenzyme Synthesis of Benzoin (Data Sheet) Running the reaction: 0.65 g of thiamine hydrochloride were dissolved in 2 mL of water in a 6-dram vial 10 mL of 95 % ethanol were added to the mixture and the mixture swirled until it was homogeneous Next, 2.10 mL of 4 N sodium hydroxide solution was added dropwise. The solution turned bright yellow at first but was pale yellow at the end 6.00 mL of benzaldehyde were added and the mixture was swirled until the aldehyde completely dissolved leading to a pale-yellow solution The vial was tightly closed and stored in the drawer Product isolation: After two days, the vial contained a copious amount of long crystals The vial was placed in an ice bath for 15 minutes The solids were isolated by vacuum filtration on a Hirsch funnel The yellowish solids were rinsed with three portions of ice-cold water and two portions of ice-cold 95 % ethanol (5 mL each); the crystals were white afterward After sucking air through the crystals, they were allowed to dry Product characterization: 4.45 g of the product М.p.: 134-137 °C
Transcribed Image Text:Experiment 9A: Coenzyme Synthesis of Benzoin (Data Sheet) Running the reaction: 0.65 g of thiamine hydrochloride were dissolved in 2 mL of water in a 6-dram vial 10 mL of 95 % ethanol were added to the mixture and the mixture swirled until it was homogeneous Next, 2.10 mL of 4 N sodium hydroxide solution was added dropwise. The solution turned bright yellow at first but was pale yellow at the end 6.00 mL of benzaldehyde were added and the mixture was swirled until the aldehyde completely dissolved leading to a pale-yellow solution The vial was tightly closed and stored in the drawer Product isolation: After two days, the vial contained a copious amount of long crystals The vial was placed in an ice bath for 15 minutes The solids were isolated by vacuum filtration on a Hirsch funnel The yellowish solids were rinsed with three portions of ice-cold water and two portions of ice-cold 95 % ethanol (5 mL each); the crystals were white afterward After sucking air through the crystals, they were allowed to dry Product characterization: 4.45 g of the product М.p.: 134-137 °C
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