Benzoic acid (C₆H₅COOH) and aniline (C₆H₅NH₂) are both derivatives of benzene. Benzoic acid is an acid with K_a = 6.3 × 10^-5 and aniline is a base with K_a = 4.3 × 10^-10.

(a) What are the conjugate base of benzoic acid and the conjugate acid of aniline?

(b) Anilinium chloride (C₆H₅NH₃Cl) is a strong electrolyte that dissociates into anilinium ions (C₆H₅NH₃⁺) and chloride ions. Which will be more acidic, a 0.10 M solution of benzoic acid or a 0.10 M solution of anilinium chloride?

(c) What is the value of the equilibrium constant for the following equilibrium?

C₆H₅COOH(aq) + C₆H₅NH₂(aq) ⇌ C₆H₅COO^-(aq) + C₆H₅NH³⁺(aq)

Transcribed Image Text:

OH H. H Benzoic acid Aniline