Chemistry · FRQ Trainer

A 0.500 L buffer solution contains 0.20 M acetic acid (CH₃COOH, Ka = 1.8×10⁻⁵) and 0.20 M sodium acetate (CH₃COONa). (a) Calculate the pH of the buffer. (b) Calculate the new pH after 0.010 mol of solid NaOH is added (assume no volume change). (c) Explain why this solution resists changes in pH. (d) Identify which component reacts with added HCl.