The electrolysis of 0.250 L of a brine solution (NaCl) was carried out for a period of 20.00 min with a current of 2.00 A in an apparatus that prevented Cl2 from reacting with other products of the electrolysis. The resulting solution was titrated with 0.620 M HCl. How many mL of the HCl solution was required for the titration?