A buffered solution is prepared by adding 0.40 mol of acetic acid (CH3COOH) and 0.50 mol of sodium acetate (CH3COONa) to make up a volume of 1.0 L.

(a) Calculatetheinitialconcentration(inM)ofaceticacidandtheacetateioninsolution.(Given that sodium acetate is a strong electrolyte which completely dissociated into sodium ion (Na+) and acetate ion (CH3COO-) in aqueous solution.) [2 marks]

(b) Given that the acidity (pKa) of acetic acid is 4.745, write the equilibrium and equilibrium constant expression (Ka) for the dissociation of acetic acid (CH3COOH). [2 marks]

(c) With the aid of an ICE table, determine the equilibrium [H+] at equilibrium and the pH of this buffer solution.