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

3 Views|Posted 8 months ago
Asked by Shiksha User
1 Answer
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8 months ago

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+ 1 2  ?(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+ 1 2  ?(pKa?−pKb?) =7

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven 2025

Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven 2025

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