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

Question 49

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 0.87 mol L-1 sodium cyanide (NaCN) ?


A) 0.06
B) 13.94
C) 4.2 × 10-3
D) 2.38
E) 11.62

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