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A beaker with 195 mL of acetic acid buffer with a pH of 5.000 is sitting...

A beaker with 195 mL of acetic acid buffer with a pH of 5.000 is sitting in a lab. The total molarity of acid and conjugate base in the buffer is 0.100 M. If 8.50 mL of 0.330 M HCl solution is added to the beaker, how much would the pH change? the pKa of the acetic acid is 4.740.

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