A beaker with 1.30×102 mL of an acetic acid bufferwith a pH of 5.000 is sitting on a benchtop. The total molarity ofacid and conjugate base in this buffer is 0.100 M. Astudent adds 5.40 mL of a 0.440 MHCl solution to thebeaker. How much will the pH change? The pKa of aceticacid is 4.740.
Express your answer numerically to two decimal places. Use aminus ( ? ) sign if the pH has decreased.
