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19 January, 19:21

Calculate the ratio of naf to hf required to create a buffer with ph = 4.05.

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  1. 19 January, 19:39
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    PH is the test of acidity or basicity of a solution. it follows the formula:

    pH = pKa + log [salt] / [acid] where NaF is the salt and HF is the acid in this case.

    By literature, Ka of HF is 3.5*10^-4

    pKa = - log (Ka) = 3.46

    pH = pKa + log [NaF / [HF]

    4.05 = 3.46 + log [NaF / [HF]

    log [NaF / [HF] = 0.59

    [NaF / [HF] = 3.89
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