Ka for CH3COOH is 1.8 × 10–5 and K b for NH4OH is 1.8 × 10–5 . The pH of ammonium acetate will be
(i) 7.005
(ii) 4.75
(iii) 7.0
(iv) Between 6 and 7
Ka for CH3COOH is 1.8 × 10–5 and K b for NH4OH is 1.8 × 10–5 . The pH of ammonium acetate will be
(i) 7.005
(ii) 4.75
(iii) 7.0
(iv) Between 6 and 7
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1 Answer
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This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option(iii)
The equation for weak acid and weak base is given as-
pH=7+ ?(pKa?−pKb?)
Ka=1.8×10-5
pKa=−log (1.8×10-5) =5−log1.8 =4.744
pKb?=−log (1.8×10-5) =4.744
pH=7+ ?(pKa?−pKb?) =7
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