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 ...