K_afor HCN is 4.9 × 10^-¹⁰. What is the pH of a 0.068 M aqueous solution of sodium cyanide?

Name: K a for HCN is 4.9 × 10 - 10 . What is the pH of a 0.068 M aqueous solution of sodium cyanide?
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Question

Quizplus · Accepted Answer

Sodium cyanide (NaCN) dissociates in water to form CN⁻, which is the conjugate base of HCN. The Kb for CN⁻ can be calculated using Kw/Ka. The pH of the solution is basic, and the calculated pH is approximately 11.

Ka for HCN Is 4

K_afor HCN Is 4