In experiment 17, hydrogen peroxide was titrated with potassium permanganate in acidic solution: MnO4- (aq) + 8H+ (aq) + 5e- -> Mn2+ (aq) + 4H2O (l) + O2 (g)
When the redox reaction is balanced, the coefficients are:
MnO4-: 1
H2O2: 5
Mn2+: 1
H2O: 4
O2: 1
15.0 mL of a peroxide solution has a mass of 15.40 g. If 24.60 mL of 0.150 M KMnO4 solution is required to reach the endpoint, the percent by mass of the peroxide solution is: