Question

$NH_4CN$ is a salt of weak acid $HCN (K_a = 6.2 \times 10^{-10})$ and a weak base $NH_4OH (K_b = 1.8 \times 10^{-5})$. A one molar solution of $NH_4CN$ will be

• A. neutral
• B. strongly acidic
• C. strongly basic
• D. weakly basic

Answer 1

Answer: (D)

weakly basic

Answer 2

Since $K_b > K_a$, the solution will be slightly basic.