First problem - add H+ ions as needed to balance charge; add H2O as needed to balance H atoms.
H2O2 + (Cr2O7)-2 --> Cr+3 + O2
Problem 2 - add OH- ions as needed to balance charge; then add H2O as needed to balance H atoms.
(HO2)- (note: peroxide ion) + (CrO2)- --> (CrO4)-2
Can someone explain the procedures to balancing the equations please?? Thx