Ka of acetic acid is 2 x 10-5 . Buffer capacity of CH3COOH + CH3COONa buffer is maximum at a pH of

  1. A

    3.7

  2. B

    4.7

  3. C

    5.7

  4. D

    7

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    Solution:

    pKaCH3COOH=log 2×105                            =5log 2                            =4.7 Buffer capacity is maximum when pH=pKa

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