Calculate the pH of a solution of given mixtures;
(a) (4g CH3COOH + 6g CH3COONa) in 100 mL of mixture; Ka for CH3COOH = 1.8 x 10-5
(b) 5 mL of 0.1 MA/OH + 250 mL of 0.1 M MCI, Ka for MOH = 1.8 x 10-5
(c) (0.25 mole of CH3COOH + 0.35 mole of CH3COONa) in 500 mL mixture; Ka for CH3COOH = 3.6 x 10-4