L1 /
12
CH1012
BALANCING REDOX EQNS III
Balancing a redox rxn in Basic Solution
Balance as per acidic solution steps 1 - 8.
9) Add OH- to both sides of
balanced eqn.,
the no of OH- added = no of H+ in eqn.
the no of OH- added = no of H+ in eqn.
10) Add the OH- and H+ on the same side
of each half rxn to form water(s).
of each half rxn to form water(s).
11) Cancel waters (LHS
vs RHS)
12) Do an atom balance LHS = RHS.
Balancing a redox reaction
e.g. given Cr2O72-(aq + Fe2+(aq ® Cr3+(aq + Fe3+(aq
e.g. given Cr2O72-(aq + Fe2+(aq ® Cr3+(aq + Fe3+(aq
balanced
equation in acidic solution.
Cr2O72-(aq) + 14H+(aq + 6Fe2+(aq®
2Cr3+(aq+ 7H2O(l) + 6Fe3+(aq
