The pKb of CNis 4.7. The pH of solution prepared by mixing 2.5 mol of KCN of 2.5 mol of HCN in water — Ionic Equilibrium Chemistry Question
Question
The pKb of CNis 4.7. The pH of solution prepared by mixing 2.5 mol of KCN of 2.5 mol of HCN in water and making the total volume up to 500 mL is
Answer: B
💡 Solution & Explanation
KCN and HCN make an acidic buffer solution. Molarity of 2.5 mole KCN 1000 5 Molar 500 x Molarity of 2.5 mole HCN 1000 5 Molar 500 x b pK of CN= 4.7 that means a pK of HCN = 9.3 salt pH pK log acid a pH 9.3 log1 9.3
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