A Student Is Tasked to Determine the PH of a Solution

A student is tasked to determine the pH of a solution prepared by dissolving 20.0 mmol sodium acetate,10.0 mmol sodium oxalate (NaO₂CCO₂H) ,and 15.0 mmol potassium chloride in enough water to prepare 1.00 L of solution.Which of the following will simplify the algebra used to solve the problem? I.Write fractional composition equations for each acid and base in the charge balance equation.
II Substitute the fractional composition equations into the charge balance equation and enter the known values of sodium,potassium,and chloride.
III Assume the weakest acid will not contribute significantly to the pH of the solution.
IV Use a spreadsheet to perform the calculations.

A) IV only
B) I,II,and III
C) I,II,III,and IV
D) II,III,and IV
E) I,II,and IV