## Answers

Question is based on concept of acidic buffer solution.P^{H} is calculated by Henderson equation

[CH3COOK ] = 0.02 M x 30 mL / ( 30 + 30 ) mL = 0.01 M

[ CH3COOH] = 0.1 M x 30 mL / ( 30 + 30 ) mL = 0.05 M

P^{H} = P^{Ka} + log {[ CH3COOK ] / [ CH3COOH]}

P^{H} = —log ( 1.8 x 10^{–5} ) + log ( 0.01 M / 0.05 M )

= 4.74 - 0.69 = 4.05

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