Q14 of 54 Page 86

Ka for CH3COOH is 1.8 × 10-5 and Kb for NH4OH is 1.8 × 10-5. The pH of ammonium acetate will be

Ammonium acetate is a salt which is formed by weak acid CH3COOH and weak base


NH4OH


slide-33.jpg


For salts of weak acid and weak base :


pH = 1/2 [pKw + pKa – pKb ]


= 1/2 [14 – log (1.8 × 10-5) + log (1.8 × 10-5 )]


= 7

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