What volume of 0.1 M HCOONa solution should be added to 50 ml of 0.05 M formic acid to produce a buffer solution of pH = 4.0, pKa of formic acid = 3.7 ?

What volume of 0.1 M HCOONa solution should be added to 50 ml of 0.05 M formic acid to produce a buffer solution of pH = 4.0, pKa of formic acid = 3.7 ?

  1. A

    50 ml

  2. B

    40 ml

  3. C

    30 ml

  4. D

    60 ml

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    Solution:

    (1)

    Let V ml of 0.1 M HCOONa be mixed to 50 ml of 0.05 M HCOOH in mixture

    HCOONa = 0.1 ×VV + 50 HCOOH = 50 × 0.05V+50 pH = - log Ka + log  SaltAcid 4.0 = 3.7 + log  0.1 × V/V+502.5 / V + 50 V=50 ml.

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