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JEE Main Chemistry question

ChemistryEquilibriumJEE Main

How many mole of HCl are required to prepare one litre of buffer solution (containing NaCN+HCl) of pH 8.5 using 0.01 g formula weight of NaCN =4.1×10⁻¹⁰)?

Answer: (A)

Solution

pKa(HCN)=9.39; log([CN⁻]/[HCN])=8.5−9.39=−0.887 → ratio=0.130. With

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Question ID VK-136295