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Q.

Calculate pH of 0.10 N acetic acid having Ka=1.8×10-5

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a

2.8

b

5.6

c

6.8

d

3.4

answer is A.

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Detailed Solution

CH3COOH⇌CH3COO-+H+(weak acid) Initially           l                        0                    0At equil.         (1-α)                  α                   α[H+]=Cα  or C·KaC=KaC=1.8×10-5×0.1=1.34×10-3MpH=-log H+=-log1.34×10-3=2.87
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Calculate pH of 0.10 N acetic acid having Ka=1.8×10-5