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19 April, 00:00

You are asked to prepare a ph = 4.00 buffer starting from 1.50 l of 0.0200 m solution of benzoic acid (c6h5cooh and some added sodium benzoate salt (c6h5coona. a find the ph of the benzoic acid solution before adding the salt. b use the henderson-hasselbalck equation to derive how many moles of the salt you should add. c how many grams of the salt should you add?

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  1. 19 April, 00:17
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    The henderson-hasselbalck equation is this

    pH = pK + log [salt]/[acid]

    We are given with

    pH = 4.00

    1.50 l of 0.0200 m solution of benzoic acid

    The pK for benzoic acid is

    4.20

    Solving for the moles of salt,

    4 = 4.2 + log 1.5 (0.02) / n

    n = 71.62 moles

    The mass is

    m = 71.62 (249.2)

    m = 17800 grams
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