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5 November, 16:58

What is the [ch3co2-]/[ch3co2h] ratio necessary to make a buffer solution with a ph of 4.34? ka = 1.8 * 10-5 for ch3co2h?

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  1. 5 November, 17:11
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    According to Henderson-Hasselbalch Equation,

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

    As,

    pKa = - log Ka

    pKa = - log (1.8 * 10⁻⁵)

    pKa = 4.74

    So,

    pH = 4.74 + log [Acetate] / [Acetic Acid]

    4.34 = 4.74 + log [Acetate] / [Acetic Acid]

    4.34 - 4.74 = log [Acetate] / [Acetic Acid]

    -0.40 = log [Acetate] / [Acetic Acid]

    Taking Antilog on both sides,

    [Acetate] / [Acetic Acid] = 0.398
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