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Calculate the pH of the buffer solution ...

Calculate the pH of the buffer solution containing 50 mL 0.2(M) `CH_3COOH` and 50mL 0.1(M) `CH_3COONa` solution. `[pK_a(CH_3COOH) = 4.74]`

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`pH=14-pK_b-log([BH^+])/([B])` or `9=14-pK_b-log(0.02)/(0.2)` or , `pK_b=6" ":.K_b=10^(-6)`
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