8. What is the pH of a solution of 0.05M NaCN.

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Answer 1

Answer #1

NaCN is salt of weak acid HCN and strong base NaOH

for such salts

pH = 1/2 [pKw + pKa + log C]

pKa of HCN = 9.2

pH = 1/2 [ 14 + 9.2 + log 0.05]

pH = 1/2 [21.90]

pH = 10.95

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Answer 2

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