marrieshasmith2782 marrieshasmith2782 19-08-2021 Chemistry contestada A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 66.2 mL of KOH is __________ M. a. 0.723 b. 1.00 × 10-7 c. 2.81 × 10-13 d. 0.439 e. 0.273