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Calculate the pH of an aqueous solution of 0.2 M ammonium formate assuming complete dissociation

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Calculate the pH of an aqueous solution of 0.2 M ammonium formate assuming complete dissociation (pKa of formic acid = 3.8 and pKb of ammonia = 4.8)

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HCOONH4 + H2O ⇌ HCOOH + NH4OH

The pH of the salt of weak acid and weak base is given by

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