Calculate pH from the Henderson-Hasselbalch equation to give you the initial pH.
Then to that buffer you add 2.50 mL x 0.150 M HCl to 100 mL. That will add 0.000375 moles HCl. That will increase the mole CH3COOH by that amount and decrease moles CH3COONa by that amount. Calculate new values for concn CH3COOH and CH3COONa, plug into the HH equation and calculate the new pH.
If you add 2.50 mL of .150 M HCl to 100 mL of a buffer consisting of .100 M CH_3COOH and .200 M CH_3COONa, what will be the change in pH? (Ka of CH_3COOH is 1.7 x 10^-5).
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