H2○2既有氧化性又有还原性 E A O20.6945VH2O,1.763VH,O E B HO,+H,o+2e=30H. EB=0.867V 3H2O2+2MnO4==2MnO2+302↑+20H+2H2O 5H.O,+2MnO,+6H+ Mn+5O2↑+8H2O H,02+Mn(OH)-- Mno2+ 2H20 3H,O,+ NaCro, +2NaOH== 2Na2 CrO4+4H2O H2O2+2Fc2+2H=2c+2H2O3H2O2 + 2MnO4 －== 5H2O2 + 2MnO4 －+6H+ == H2O2 + Mn(OH)2 == 3H2O2+2NaCrO2+2NaOH == H2O2+2Fe2++2H+ == H2O2既有氧化性又有还原性 2MnO2↓+3O2↑+2OH-+2H2O 2Mn2++5O2 ↑ +8H2O MnO2 ↓ + 2H2O 2Fe3++2H2O 2Na2CrO4 + 4H2O O2 0.6945V H2 O2 1.763V H2 O EB EA HO H O 2e 3OH , 0.867V － － 2 － 2 + + EB =