Suppose that a student is determining the total base content of an antacid tablet by performing a back titration. He/she weighs out a 0.4022 g portion of a tablet whose total weight is 0.8332 g, dissolves this in exactly 50.00 mL of deionized water, and then adds exactly 12.50 mL of 0.2000M HCl in order to bring the pH down to 1.9. This solution is then carefully back-titrated with 0.1050M NaOH, with 4.77 mL required to reach the equivalence point. Calculate the total base content (i. e., the number of mmoles of base contained) of the antacid tablet. (Formula weight of HCL