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You are asked to prepare a pH=4.00 buffer starting from 1.50 L of 0.0200 \; M solution of benzoic acid C_6 H_5COOH and an excess of sodium benzoate C_ H_5 COONa.

How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when the sodium benzoate is added. (in grams)

  • Chemistry -

    Use the HH equation to determine mols sodium benzoate, then mols = grams/molar mass.

  • Chemistry -


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