Calculate the pH of 100 mL of a buffer solution containing 0.05 M benzoic acid (C6H5CO2H; Ka = 6.4 x 10-5) and 0.05 M sodium benzoate (NaC6H5CO2).(Note: please report your pH value to two decimal places.)WebAssign will check your answer for the correct number of significant figures. Correct: Your answer is correct. (e) Calculate the pH after adding 10 mL of 0.10 M HNO3 to the solution in part