A buffer solution was prepared by adding 4.96 g of sodium acetate,NaCH3CO2, to 2.50x 10^2  mL of 0.170 M acetic acid, CH3CO2H  (Ka=1.8 x 10^-5).  What is the pH of the system if you add 72 mg of NaOH to the 1.00x 10^2 mL of the prepared buffer solution?

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