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Kathy weighed out 6.20 grams of sodium benzoate, NaC7H5O2 along with 2.25 grams of benzoic acid,...

Kathy weighed out 6.20 grams of sodium benzoate, NaC7H5O2 along with 2.25 grams of benzoic acid, HC7H5O2, and dissolved it together in 750.0 mL of water.

What is the pH of this solution if Kathy adds 1.50 mL of 1.0 M HCl to 20.00 mL of this solution? (no clue on how to do this, please show me)

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