Chemistry

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?

asked by Lacy
  1. Give specific details about what youi don't understand.

    posted by DrBob222
  2. I don't understand part a)
    How to start the process of finding the pH

    posted by Lacy

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