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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

Correct Answer:

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