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13 December, 20:33

Calculate the ph of a buffer that is 0.13m in lactic acid and 0.10m in sodium lactate.

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  1. 13 December, 20:52
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    According to Henderson-Hasselbalch Equation,

    pH = pKa + log [Lactate] / [Lactic Acid]

    As,

    Ka of Lactic Acid = 1.38 * 10⁻⁴

    pKa = - log Ka

    pKa = - log 1.38 * 10⁻⁴

    pKa = 3.86

    So,

    pH = 3.86 + log [0.10] / [0.13]

    pH = 4.74 + log 0.769

    pH = 4.74 - 0.11

    pH = 4.63
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