Calculate Ka for hydrogen peroxide. you may use the reactions given on the data sheet, Kw=1.0x10^-14. Assume that hydrogen peroxide is a monoprotic acid.
O2 + H2O + 2e- .........>HO2- + OH- E0= - 0.08V
H2O2 + 2H+ +2e- ......>2H2O E0= 1.78V
O2 + 2H2O + 4e- ........>4OH- E0= 0.40V