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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

3.4

c

6.8

d

5.6

answer is A.

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Detailed Solution

                CH3COOHCH3COO-+H+(weak acid) 

Initially           l                        0                    0

At equil.         (1-α)                  α                   α

[H+]=  or C·KaC=KaC

=1.8×10-5×0.1=1.34×10-3M

pH=-log H+=-log1.34×10-3=2.87

 

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