5. If a buffer solution contains 0.0100 mol of KCN and 0.0100 mol HCN at pH...

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Answer 1

Answer #1

The HCl reacts with the salt and forms acid, then the new pH is calculated:

pH = - log Ka + log (n Salt / n Acid) = - log 6.2x10 ^ -10 + log (0.01 - 5x10 ^ -5 / 0.01 + 5x10 ^ -5) = 9.20

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Answer 2

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