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prepare a pH=4.00 buffer starting from 1.50 L of 0.0200 M solution of benzoic acid (C6H5COOH) and an excess of sodium benzoate (C6H5COONa). 1. What is the pH of the benzoic acid solution prior to adding sodium benzoate? Express answer using 3 significant figures. 2. 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. Express your answer using two significant figures.

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