Question

Salt of weak acid and weak base (i) Calculate pH of the mixture (25 mL of 0.1 M NH₄ OH + 25 mL of 0.1 M CH₃COOH). Given that K_a : 1.8 × 10^–5, and K_b = 1.8 × 10^–5.

Answer 1

As salt is formed (salt of weak acid and weak base) and pH will be decided by salt hydrolysis

= 1/2(–log 10^–14 – log 1.8 × 10^–5 + log 1.8 × 10^–5) = 7