Explain how much will the ph change

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Problem- A beaker with 105mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.10mL of a 0.340M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.

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