1. HCN is a weak acid (Ka=6.20×10-10) , so the salt, KCN , acts as a weak base. What is the pH of a solution that is 0.0570 M in KCN at 25 °C?

Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter13: Acids And Bases
Section: Chapter Questions
Problem 74QAP: Consider pyridine, C5H5N, a pesticide and deer repellent. Its conjugate acid, C5H5NH+, has K a...
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1. HCN is a weak acid (Ka=6.20x10-10) , so
the salt, KCN , acts as a weak base. What is
the pH of a solution that is 0.0570 M in KCN
at 25 °C?
2. A solution was prepared with 0.464 mol
of pyridinium fluoride (C5H5NHF) and
enough water to make a 1.00 L. Pyridine
(C5H5N) has a Kb=1.70×10-9 and HF has a
Ka=6.30x10-4.
Transcribed Image Text:1. HCN is a weak acid (Ka=6.20x10-10) , so the salt, KCN , acts as a weak base. What is the pH of a solution that is 0.0570 M in KCN at 25 °C? 2. A solution was prepared with 0.464 mol of pyridinium fluoride (C5H5NHF) and enough water to make a 1.00 L. Pyridine (C5H5N) has a Kb=1.70×10-9 and HF has a Ka=6.30x10-4.
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