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.

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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])

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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