If 30 mL of 0.100 M weak acid (HA, Ka= 3.5 x 10^-4) is titrated with a 0.120 M solution of KOH, determine the pH after 30 mL of KOH has been added. Assume thtat less than 5% of the acid ionizes in solution

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
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If 30 mL of 0.100 M weak acid (HA, Ka= 3.5 x 10^-4) is titrated with a 0.120 M solution of KOH, determine the pH after 30 mL of KOH has been added. Assume thtat less than 5% of the acid ionizes in solution. 

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The solution in the book said the total volume was 25 + 30, and I don't understand why. Is this an error in their solution?

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