A student is asked to determine the value of Ka for nitrous acid by titration with sodium hydroxide. The student begins titrating a 32.1 mL sample of a 0.554 M aqueous solution of nitrous acid with a 0.305 M aqueous sodium hydroxide solution, but runs out of standardized base before reaching the equivalence point. The student's last observation is that when 37.8 milliliters of sodium hydroxide have been added, the pH is 3.580. What is Ka for nitrous acid based on the student's data?

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
Chapter15: Acid–base Equilibria
Section: Chapter Questions
Problem 57P
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A student is asked to determine the value of Ka for nitrous acid by titration with sodium hydroxide.
The student begins titrating a 32.1 mL sample of a 0.554 M aqueous solution of nitrous acid with a 0.305 M aqueous sodium hydroxide
solution, but runs out of standardized base before reaching the equivalence point. The student's last observation is that when 37.8 milliliters of
sodium hydroxide have been added, the pH is 3.580.
What is Ka for nitrous acid based on the student's data?
Transcribed Image Text:A student is asked to determine the value of Ka for nitrous acid by titration with sodium hydroxide. The student begins titrating a 32.1 mL sample of a 0.554 M aqueous solution of nitrous acid with a 0.305 M aqueous sodium hydroxide solution, but runs out of standardized base before reaching the equivalence point. The student's last observation is that when 37.8 milliliters of sodium hydroxide have been added, the pH is 3.580. What is Ka for nitrous acid based on the student's data?
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