Question

What is the half equation for Fe2+ + MnO4-=Fe3+ +Mn2+ ?

i need help!!!!!!!!!11What is the half equation for Fe2+ + MnO4-=Fe3+ +Mn2+

Answer 1

Half equations are exclusively OXIDATION or REDUCTION reactions, in which electrons are introduced as virtual particles...

Explanation:

`"Ferrous ion"` is oxidized:

`Fe^(2+) rarr Fe^(3+) + e^(-)` `(i)`

And `"permanganate ion"` is reduced:

`MnO_4^(-)+8H^+ +5e^(-)rarr Mn^(2+) + 4H_2O(l)` `(ii)`

For each half-equation charge and mass are balanced ABSOLUTELY, and thus it reflects stoichiometry. TO produce a balanced equation, we adds `(i)` and `(ii)` in such a way as to remove the electrons as virtual particles of convenience...

i.e. `5xx(i)+(ii)` gives....

`5Fe^(2+) +MnO_4^(-)+8H^+ +5e^(-)rarr 5Fe^(3+)+Mn^(2+) + 4H_2O(l) + 5e^(-)`

...and after cancellation....

`5Fe^(2+) +MnO_4^(-)+8H^+ rarr 5Fe^(3+)+Mn^(2+) + 4H_2O(l)`

The which is balanced with respect to mass and charge....and note that the colour change of the reaction, deep-purple permanganate to almost colourless `Mn^(2+)`, would give us a visual gauge on the extent of reaction.