HCN is a weak acid (?a=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?

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Chapter1: Chemical Foundations
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1. HCN is a weak acid (?a=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?

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 ?b=1.70×10−9 and HF has a ?a=6.30×10−4. 

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