A beaker with 145 mLmL of an acetic acid buffer with a pHpH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is 0.100 mol L−1mol L−1. A studentadds 6.70 mLmL of a 0.360 mol L−1mol L−1 HClHCl solution to thebeaker. How much will the pHpH change? The pKapKa of acetic acid is4.760.
Express your answer numerically to two decimal places. Use aminus ( −− ) sign if the pHpH has decreased.
