Calculate the pH of a buffer prepared by mixing 0.10 mol of sodium formate and 0.05 mole of formic acid in 1.0 L of solution. [ : Ka =1.8 × 10–4]

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Question

Calculate the pH of a buffer prepared by mixing 0.10 mol of sodium formate and 0.05 mole of formic acid in 1.0 L of solution. [$HCO_2H$ : Ka =1.8 × 10–4]

Prashant Kotian · Accepted Answer

Correct answer: C. HCOOH + HCOONa forms acidic Buffer Thus, mole of formate ion pH = pKa + log mole of formic acid 0.1 pH = 3.745 + log 0.05 pH = 4.05 IONIC EQUILIBRIUM 40

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