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1)

pKof a weak acid (HA) and pKof a weak base (BOH) are 3.2 and 3.4  respectively. The pH of their salt (AB) solution is


A) 7.2

B) 6.9

C) 7.0

D) 1.0

Answer:

Option B

Explanation:

For a salt of the weak acid and weak base.

               pH=7+12pKa12pKb

Given,    pKa(HA)=32,pKa(BOH)=3.4

        pH=7+12(3.2)12(3.4)

           =7+1.6-1.7 = 6.9