chemistry

I need to calculate the amount of grams of Na-benzoate in a Na-benzoate buffer (water based) with a pH = 4.2 at 25'C?

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  1. Use the Henderson-Hasselbalch equation.
    pH = pKa + log [(base)/(acid)]
    (base) = concn of the salt.
    (acid) = concn benzoic acid.

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