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

Question 86

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 0.040 M sodium cyanide (NaCN) ?


A) 10.96
B) 3.04
C) 9.0 × 10-4
D) 1.1 × 10-11
E) 2.0 × 10-11

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