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20 m l of 0.1 M N a O H is added to 30 ml 0.1 M NaOH 30 ml 0.2 M CH 3 COOH pK a = 4.74 , calculate the pH of the resulting solution? [given: log ⁡ 2 = 0.3 ]

Options

  1. A3.44
  2. B4.01
  3. C4.44
  4. D4.71

Correct answer

C. 4.44

Step-by-step solution

N a O H + C H 3 C O O H → C H 3 C O O N a + H 2 O m m o l 2 6 L R - 4 2 The resulting solution is an acidic buffer. so pH = pK a + log Salt Acid = 4.71 + log ⁡ 2 4 = 4.44

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