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Q.

What will be the pH at the equivalence point during the titration of a 100 mL 0.2 M solution of CH3COONa with 0.2 M solution of HCl ?  Ka = 2 × 10-5.

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a

3 - log 2

b

3 + log 2

c

3 - log 2

d

3 + log 2

answer is A.

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Detailed Solution

CH3COONa   +     HCl    →       NaCl    +   CH3COOH t = 0 ;        20 meq             20 meq                  0                   0 teq   ;            –                       —                                        20 meq  CH3COOH=20200 = 0.1 MpH = 12 pKa - log C      = 12 5 - log 2 -log10-1   (∵Ka=2×10-5)      = 12 6 - log 2 = 3 - log 2
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What will be the pH at the equivalence point during the titration of a 100 mL 0.2 M solution of CH3COONa with 0.2 M solution of HCl ?  Ka = 2 × 10-5.