Product characterization: 0.91 g of the crude product 0.77 g of the final product M.p. (crude): 85-93 °C • M.p. (final): 104-106 °C

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter8: Sampling, Standardization, And Calibration
Section: Chapter Questions
Problem 8.1QAP
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how do 
I find the yield with the characterization 

Product characterization:
0.91 g of the crude product
0.77 g of the final product
М.р. (crude): 85-93 °C
М.р. (final): 104-106 °C
Transcribed Image Text:Product characterization: 0.91 g of the crude product 0.77 g of the final product М.р. (crude): 85-93 °C М.р. (final): 104-106 °C
Setup:
• placed 1.15 g of 1,4-dimethoxybenzene, 2.2 mL of tert.-butyl alcohol, and 3.4 mL glacial
acetic acid in a 125-mL Erlenmeyer flask
• the mixture was swirled until the solids dissolved and then placed in an ice bath for
10 minutes
Running the reaction:
• 4.50 mL of concentrated sulfuric acid were placed in an ice bath for 10 minutes
• the sulfuric acid was added dropwise to the cooled reaction mixture while swirling
(~ 10 minutes)
• the reaction mixture was placed on the bench and allowed to warm up to room temperature
(~15 minutes), was swirled three times during this time
Product isolation:
• 14 g of ice was added to the reaction mixture before 50 mL of water was added to cause
precipitation of a beige-colored solid
• the solids were isolated on a small Büchner funnel using vacuum filtration, washed with
water, and allowed to dry until the next meeting
• the crude product was recrystallized from a total of 10 mL of hot methanol
• the solution could cool to room temperature (~10 minutes) and then placed in an ice bath
(~15 minutes)
• Upon cooling, a light beige solid formed that was isolated by vacuum filtration
• The solid was washed with 2 mL of ice-cold methanol and then air sucked through the
solids to dry them (20 minutes)
Product characterization:
0.91 g of the crude product
• 0.77 g of the final product
М.р. (сrude): 85-93 °C
М.р. (final): 104-106 °C
Transcribed Image Text:Setup: • placed 1.15 g of 1,4-dimethoxybenzene, 2.2 mL of tert.-butyl alcohol, and 3.4 mL glacial acetic acid in a 125-mL Erlenmeyer flask • the mixture was swirled until the solids dissolved and then placed in an ice bath for 10 minutes Running the reaction: • 4.50 mL of concentrated sulfuric acid were placed in an ice bath for 10 minutes • the sulfuric acid was added dropwise to the cooled reaction mixture while swirling (~ 10 minutes) • the reaction mixture was placed on the bench and allowed to warm up to room temperature (~15 minutes), was swirled three times during this time Product isolation: • 14 g of ice was added to the reaction mixture before 50 mL of water was added to cause precipitation of a beige-colored solid • the solids were isolated on a small Büchner funnel using vacuum filtration, washed with water, and allowed to dry until the next meeting • the crude product was recrystallized from a total of 10 mL of hot methanol • the solution could cool to room temperature (~10 minutes) and then placed in an ice bath (~15 minutes) • Upon cooling, a light beige solid formed that was isolated by vacuum filtration • The solid was washed with 2 mL of ice-cold methanol and then air sucked through the solids to dry them (20 minutes) Product characterization: 0.91 g of the crude product • 0.77 g of the final product М.р. (сrude): 85-93 °C М.р. (final): 104-106 °C
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