Q2. A benzoic acid-benzoate buffer consists of 0.57 M CHCOOH and 0.57 M CHCOONa (K. of CH COOH = 6.31 x 10-5). a. Calculate pH of the buffer solution. b. Fill the following reaction table which represents a reaction between CH-COO and 0.03 mol of HBr added to 500 mL of the buffer solution. (Assume the additions cause a negligible change in volume.) Conc. (M) CH3C00- (aq) + H30+ (aq) CHCOOH (aq) + H20 (1) Initial Change Final