The Acid-Dissociation Constant of Hydrocyanic Acid (HCN)at 25 $10 ^ { - 10 }$

question 19

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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