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30 October, 00:36

A solution containing a mixture of lactic acid and lactate was found to have a pH of 3.51. Calculate the ratio of the lactate concentration to the lactic acid concentration in this solution.

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  1. 30 October, 00:43
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    0.4467

    Explanation:

    The solution of the lactic acid and lactate acts as a buffer.

    Considering the Henderson - Hasselbalch equation for the calculation of the pH of the buffer solution as:

    pH=pKa+log[Conjugate base]/[acid]

    Where Ka is the dissociation constant of the lactic acid.

    So, pKa of the lactic acid = 3.86

    pH = 3.51

    So,

    3.51 = 3.86 + log[Lactate]/[Lactic acid]

    log[Lactate]/[Lactic acid] = - 0.35

    Or,

    [Lactate]/[Lactic acid] = 0.4467
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