The Acid-Dissociation Constant of Hydrocyanic Acid (HCN)at 25

question 88

Multiple Choice

The acid-dissociation constant of hydrocyanic acid (HCN) at 25.0°C is 4.9 × 10^-10.What is the pH of an aqueous solution of 0.080 M sodium cyanide (NaCN) ?

• A) 11.11
• B) 2.89
• C) 1.3 × 10^-3
• D) 7.8 × 10^-12
• E) 3.9 × 10^-11

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