Question

Determination of Oxalate in the Iron Oxalate Complex Use the half-reaction method to balance the titration equation in acid solution. (show work) D. MnOs + (unbalanced)

Answer 1

first half
MnO4- --> Mn+2

for balancing O add 4 H2O to product side
MnO4- --> Mn+2 + 4H2O

for balancing H add 8 H+ to reactant side
MnO4- + 8H+ --> Mn+2 + 4H2O

for balancing charge add 2e- to reactant side
MnO4- + 8H+ + 2e- --> Mn+2 + 4H2O

second half
H2C2O4 --> CO2

for balancing C multiply the cofficient of CO2 by 2
H2C2O4 --> 2CO2

for balancing H add 2 H+ to product side
H2C2O4 --> 2CO2 + 2H+

for balancing charge add 2e- to product
H2C2O4 --> 2CO2 + 2H+ + 2e-

add first half and second half
MnO4- + 6H+ + H2C2O4 --> Mn+2 + 2CO2 + 4H2O