Q 1179101916.     `20` mL of `0.2 M` sodium hydroxide is added to `50 mL` of `0.2 M` acetic acid solution to give `70 mL` of the solution. What is the `pH` of this solution? Calculate the additional volume of `0.2 M NaOH` required to make the `pH` of the solution `4.74 (`Ionisation constant of `CH_3COOH = 1.8 × 10^(-5)). `

JEE 1982
A

`3.22, 5.0` mmol

B

`4.56, 5.0` mmol

C

`3.22, 3.0` mmol

D

`4.56, 3.0` mmol

HINT

Use formula: `pH = pK_a + log ( [CH_3COONa]/[CH_3COOH]) `

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