(8 marks)
2. Calculate the pH of a buffer prepared by mixing HA with NaA. The buffer contains HA at a
concentration of 0.25 mol L-¹ After 0.20g NaOH is added to 100mL of this buffer, the pH of the
resulting solution is 5.60. The acid-ionization constant of HA is 5.0x106.
(10 marks)
