One liter of a solution contains 0.120 moles of benzoic acid C6H5COOH (Ka = 6.5 x 10-5) and 0.105 moles of sodium benzoate C6H5COONa. A) Calculate the pH of this solution. B) Calculate the pH of the resulting solution after adding 100 mL of 1.20 M solution of NaOH to the starting solution; C) Calculate the pH of the resulting solution after adding 100 ML of 0.100 M HCl solution to the starting solution.
