Problem- A beaker with 160mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 6.80mL of a 0.340MHCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.
State your answer by means of two significant figures.