Trying to rember how I calculated 3.54 grams in my nitrile hydrolysis to carboxylic acid experiement. (2.37g actual yield / 3.54g theoretical yield) x 100 = 66.9%

Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter27: Gas Chromatography
Section: Chapter Questions
Problem 27.2QAP
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Trying to rember how I calculated 3.54 grams in my nitrile hydrolysis to carboxylic acid experiement. 

(2.37g actual yield / 3.54g theoretical yield) x 100 = 66.9%  

 

 

EXPERIMENTAL PROCEDURE:
From a 5 ml pipette and pi-pump containing benzonitrile, deliver 3.00 mL (3.03 g,
_moles) directly into a 250 mL round bottom flask. Add 50 mL 10% NaOH
solution and several boiling stones. Insert a reflux condenser as shown after first applying a
very thin film of stopcock grease to the male joint of the condenser to prevent the NaOH
from "freezing" the joint. Heat gently with a low Bunsen flame, frequently shaking the ring
stand to mix the organic and aqueous layers. Vapors should just slightly enter the condenser.
During the reaction, place a piece of moist red litmus paper over the top of the condenser.
The color change to blue indicates the presence of ammonia.
After about 45 minutes the reaction should be complete. Detach
the condenser before cooling the flask in ice to room temperature
and slowly pour the contents with stirring into a 250 mL beaker
which already contains 75 ml 10% HCl to protonate the benzoate
anion and precipitate the free benzoic acid. Collect the crude
product on the Buchner using a clean suction flask to collect the
filtrate. Add a few mL of 10% HCl to the suction flask to verify
that all the benzoic acid had been precipitated. Rinse the crystals
with 2 x 25 mL of ice water, breaking the suction briefly during
the rinsing step.
Transfer the crude wet crystals back into a clean 250 mL Erlenmeyer flask and recrystallize
from hot water by first adding 100 ml water and bringing to a boil and, with stirring, adding
additional 15 mL portions of water while heating to near-boiling until a hot clear solution is
obtained. Allow the solution to slowly cool and observe the gradual crystal formation. When
Transcribed Image Text:EXPERIMENTAL PROCEDURE: From a 5 ml pipette and pi-pump containing benzonitrile, deliver 3.00 mL (3.03 g, _moles) directly into a 250 mL round bottom flask. Add 50 mL 10% NaOH solution and several boiling stones. Insert a reflux condenser as shown after first applying a very thin film of stopcock grease to the male joint of the condenser to prevent the NaOH from "freezing" the joint. Heat gently with a low Bunsen flame, frequently shaking the ring stand to mix the organic and aqueous layers. Vapors should just slightly enter the condenser. During the reaction, place a piece of moist red litmus paper over the top of the condenser. The color change to blue indicates the presence of ammonia. After about 45 minutes the reaction should be complete. Detach the condenser before cooling the flask in ice to room temperature and slowly pour the contents with stirring into a 250 mL beaker which already contains 75 ml 10% HCl to protonate the benzoate anion and precipitate the free benzoic acid. Collect the crude product on the Buchner using a clean suction flask to collect the filtrate. Add a few mL of 10% HCl to the suction flask to verify that all the benzoic acid had been precipitated. Rinse the crystals with 2 x 25 mL of ice water, breaking the suction briefly during the rinsing step. Transfer the crude wet crystals back into a clean 250 mL Erlenmeyer flask and recrystallize from hot water by first adding 100 ml water and bringing to a boil and, with stirring, adding additional 15 mL portions of water while heating to near-boiling until a hot clear solution is obtained. Allow the solution to slowly cool and observe the gradual crystal formation. When
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ISBN:
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Author:
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Publisher:
Cengage Learning