Q.

Calculate pH of a solution of given mixture (0.1 mole CH3COOH + 0.2  mole CH3COONa) in 100 ml of mixture. K = 2 × 10-5.

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a

5.0

b

5.6

c

6.6

d

7.6

answer is A.

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Detailed Solution

We havePH = - log Ka + log SaltAcid  = - log( 2 × 10-5) + log(  0.2/0.1)   =4.6990+0.3010  =5
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Calculate pH of a solution of given mixture (0.1 mole CH3COOH + 0.2  mole CH3COONa) in 100 ml of mixture. K = 2 × 10-5.