(K_w = 1.0 times 10^-14; pH = -log [H_3 O^+]; pK_a = -log K_a; pH = pK_a + log ([Base]/[Acid]) The following equation shows the ionization of lactic acid, HC_3 H_5 O_3, in which K_a = 1.4 times 10^-4: HC_3 H_5 O_3(aq) + H_2 O reversiblerarrow H_3 O^+ (aq) + C_3 H_5 O^-(aq)_3 Calculate the pH of 0.200 M lactic acid solution. What is the pH of solution of 0.200 M sodium lactate, NaC_3 H_5 O^-_3? Write two equations, one for the dissociation of sodium lactate and the other for the hydrolysis of lactate ion, C_3 H_5 O^-_3, in water. Calculate the pH of solution that is prepared by mixing 50.0 mL of 0.200 M HC_3 H_5 O_3 and 75.0 mL of 0.200 M NaC_3 H_5 0_3. Suppose that 0.0050 mole of HCI is added to solution (c), without changing its volume. Calculate the pH of the resulting solution.