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10 April, 00:08

The ph of a sodium acetate-acetic acid buffer is 4.70. calculate the ratio [ch3coo-] / [ch3cooh]

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  1. 10 April, 00:59
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    According to Henderson-Hasselbalch Equation,

    pH = pKa + log [Acetate] / [Acetic Acid]

    As, pKa of Acetic Acid = 1.76

    So, pH = 1.76 + log [Acetate] / [Acetic Acid]

    4.70 = 1.76 + log [Acetate] / [Acetic Acid]

    4.70 - 1.76 = log [Acetate] / [Acetic Acid]

    -0.04 = log [Acetate] / [Acetic Acid]

    Taking Antilog on both sides,

    [Acetate] / [Acetic Acid] = 0.912
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