Determine the ph of this buffer, Chemistry

You make up 0.100 L of a buffer having 1.00 M acetic acid and 1.10 M sodium acetate.

The Ka of acetic acid is 1.8 x 10-4.

(a) Determine the pH of this buffer.                           


(b) You then add 30.00 mL of 0.100 M HCl to the solution.  Determine the pH value after this addition.

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