At pH2.5, Aspirin solution has an apparent first- order rate constant 5 x 10-/ sec- at 25°C. What is the shelf-life of aspirin solution under these conditions?

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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please solve 2 questions.
At pH2.5, Aspirin solution has an apparent first-
order rate constant 5 x 10-/ sec-l at 25°C. What
is the shelf-life of aspirin solution under these
conditions?
A drug solution contained 500 units/mL when
prepared. It was analyzed after 40 days and
was found to contain 300 units/mL. Assuming
the decomposition is first order, at what time
will the drug have decomposed to one-half of
its original concentration?
Transcribed Image Text:please solve 2 questions. At pH2.5, Aspirin solution has an apparent first- order rate constant 5 x 10-/ sec-l at 25°C. What is the shelf-life of aspirin solution under these conditions? A drug solution contained 500 units/mL when prepared. It was analyzed after 40 days and was found to contain 300 units/mL. Assuming the decomposition is first order, at what time will the drug have decomposed to one-half of its original concentration?
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