HCN is a weak acid (Ka = 6.2 × 10–10). is a weak base (Kb = 1.8 × 10–5). A 1M solution of would be :

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HCN is a weak acid (Ka = 6.2 × 10–10). $NH_4OH$ is a weak base (Kb = 1.8 × 10–5). A 1M solution of $NH_4CN$ would be :

Prashant Kotian · Accepted Answer

Correct answer: D. 4 4 2 HCN NH OH NH CN H O 4 NH CN undergo both cationic and anionic hydrolysis and pH is calculated as per the formula a b w 1 pH = pK pK pK 2 w pK 14 a pK 9.21 b pK 4.74 Thus, pH = 9.2 (weakly basic)

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