25mL of a 0.1 M solution of weak acid is being titrated with 0.25 M NaOH. After addition of 5mL of NaOH the pH of the solution is 4.74. a. Calculate the volume of NaOH needed to reach equivalence point. b. calculate the Ka of the acid c. Calculate the volume of NaOH needed to reach a pH of 3.87

Chemistry: An Atoms First Approach
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Author:Steven S. Zumdahl, Susan A. Zumdahl
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Chapter14: Acid- Base Equilibria
Section: Chapter Questions
Problem 105CWP: Consider the titration of 100.0 mL of 0.100 M HCN by 0.100 M KOH at 25C. (Ka for HCN = 6.2 1010.)...
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25mL of a 0.1 M solution of weak acid is being titrated with 0.25 M
NaOH. After addition of 5mL of NaOH the pH of the solution is 4.74.
a. Calculate the volume of NaOH needed to reach equivalence point.
b. calculate the Ka of the acid
c. Calculate the volume of NaOH needed to reach a pH of 3.87
d. Calculate the pH at equivalence point.
e. Calculate the pH after 15mL of NaOH have been added.
Transcribed Image Text:25mL of a 0.1 M solution of weak acid is being titrated with 0.25 M NaOH. After addition of 5mL of NaOH the pH of the solution is 4.74. a. Calculate the volume of NaOH needed to reach equivalence point. b. calculate the Ka of the acid c. Calculate the volume of NaOH needed to reach a pH of 3.87 d. Calculate the pH at equivalence point. e. Calculate the pH after 15mL of NaOH have been added.
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