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

question 126

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 mol L^-1 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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