The concentration of hydrogen peroxide in an antiseptic solution was determined by titration with 0.0200 M potassium permanganate solution. 20.00 mL of the peroxide solution was
diluted to 250 mL. 20.00 mL aliquots of the diluted solution were acidified and titrated with the
potassium permanganate solution. An average volume of potassium permanganate about
18.93 mL was required. The concentration of the hydrogen peroxide solution after dilution was

2Mn0, (aq) + 5H2O2(aq) + 6H* (aq) + 2Mn2+ (aq) + 8H20(1) + 502(g)