3. Why did a mixture of 2.00 mL of pH 7.00 phosphate buffer, 0.900 mL of deionized water and 0.100 mL of 0.0300M p-nitrophenylacetate in acetonitrile have an A400 of approximately 0.03 at zero time? (Day 1, Run 1)

3. Why did a mixture of 2.00 mL of pH 7.00 phosphate buffer, 0.900 mL of deionized water and 0.100 mL of 0.0300M p-nitrophenylacetate in acetonitrile have an A400 of approximately 0.03 at zero time? (Day 1, Run 1)

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter13: Substitution

Section: Chapter Questions

Problem 8CTQ

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Question

2. Why is there a difference between the stock solution concentration of chymotrypsin
calculated from zero time y-intercepts versus the stock solution label information?
3. Why did a mixture of 2.00 mL of pH 7.00 phosphate buffer, 0.900 mL of deionized water
and 0.100 mL of 0.0300M p-nitrophenylacetate in acetonitrile have an A400 of
approximately 0.03 at zero time? (Day 1, Run 1)

7. Discuss the effect of the pH change on the steady state deacylation rate; were your
observations consistent with the proposed mechanism? Explain your answer.

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