. A 38.1 mL sample of a 0.391 M aqueous hydrocyanic acid solution is titrated with a 0.475 M aqueous sodium hydroxide solution. What is the pH after 13.1 mL of base have been added? 1b. Determine the pH change when 0.117 mol NaOH is added to 1.00 L of a buffer solution that is 0.393 M in HF and 0.224 M in F-. pH after addition − pH before addition = pH change =

Chemistry: The Molecular Science
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Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 11QRT: Briefly describe how a buffer solution can control the pH of a solution when strong acid is added...
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1a.
38.1 mL sample of a 0.391 M aqueous hydrocyanic acid solution is titrated with a 0.475 M aqueous sodium hydroxide solution. What is the pH after 13.1 mL of base have been added?

1b.

Determine the pH change when 0.117 mol NaOH is added to 1.00 L of a buffer solution that is 0.393 M in HF and 0.224 M in F-.

pH after addition − pH before addition = pH change = 
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