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7 February, 11:22

Calculate the pH of a buffer that is 0.13 M in lactic acid and 0.11 M in sodium lactate

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  1. 7 February, 15:13
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    Acidity of lactic acid = pKa = 3.85

    Ca = 0.13M

    Cs = 0.11M

    Henderson-Hasselbalch equation:

    pH = pKa + log (Cs/Ca)

    pH = 3.85 + log (0.11M/0.13M) = 3.85 + log0,846 = 3.85 - 0.073 = 3.777
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