128. One method for determining the purity of aspirin (empirical for- mula, C,H,O,) is to hydrolyze it with NaOH solution and then to titrate the remaining NaOH. The reaction of aspirin with NaOH is as follows: C,H,O,(s) + 20H (aq) Aspirin Boil C;H;O; (ag) + C,H,O, (aq) + H,0(1) Salicylate ion 10 min Acetate ion A sample of aspirin with a mass of 1.427 g was boiled in 50.00 mL of 0.500 M NaOH. After the solution was cooled, it took 31.92 mL of 0.289 M HCl to titrate the excess NaOH. Cal- culate the purity of the aspirin. What indicator should be used for this titration? Why?
128. One method for determining the purity of aspirin (empirical for- mula, C,H,O,) is to hydrolyze it with NaOH solution and then to titrate the remaining NaOH. The reaction of aspirin with NaOH is as follows: C,H,O,(s) + 20H (aq) Aspirin Boil C;H;O; (ag) + C,H,O, (aq) + H,0(1) Salicylate ion 10 min Acetate ion A sample of aspirin with a mass of 1.427 g was boiled in 50.00 mL of 0.500 M NaOH. After the solution was cooled, it took 31.92 mL of 0.289 M HCl to titrate the excess NaOH. Cal- culate the purity of the aspirin. What indicator should be used for this titration? Why?
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 80AP
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Question
![128. One method for determining the purity of aspirin (empirical for-
mula, C,H,O,) is to hydrolyze it with NaOH solution and then
to titrate the remaining NaOH. The reaction of aspirin with
NaOH is as follows:
C,H,O,(s) + 20H (aq)
Aspirin
Boil
C;H;O; (ag) + C,H,O, (aq) + H,0(1)
Salicylate ion
10 min
Acetate ion
A sample of aspirin with a mass of 1.427 g was boiled in
50.00 mL of 0.500 M NaOH. After the solution was cooled, it
took 31.92 mL of 0.289 M HCl to titrate the excess NaOH. Cal-
culate the purity of the aspirin. What indicator should be used
for this titration? Why?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F62c56727-baee-481b-9295-7aff0a9c9ed1%2Fe3ba3914-71aa-4046-9b81-7f22c50c5ec9%2Fhh5d3br_processed.png&w=3840&q=75)
Transcribed Image Text:128. One method for determining the purity of aspirin (empirical for-
mula, C,H,O,) is to hydrolyze it with NaOH solution and then
to titrate the remaining NaOH. The reaction of aspirin with
NaOH is as follows:
C,H,O,(s) + 20H (aq)
Aspirin
Boil
C;H;O; (ag) + C,H,O, (aq) + H,0(1)
Salicylate ion
10 min
Acetate ion
A sample of aspirin with a mass of 1.427 g was boiled in
50.00 mL of 0.500 M NaOH. After the solution was cooled, it
took 31.92 mL of 0.289 M HCl to titrate the excess NaOH. Cal-
culate the purity of the aspirin. What indicator should be used
for this titration? Why?
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