Question

Show the partial equations of standardization of KMnO4 by Mohr's salt solution?

Answer 1

Well, the redox reaction is self-indicating....

Explanation:

`"Oxidation half equation..."`

`underbrace(Fe^(2+))_"Mohr's salt" rarr Fe^(3+) + e^-`

`"Reduction half equation..."`

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

And so we add FIVE of the former and ONE of the latter to get....

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

The which is balanced with respect to mass and charge (I thinks). This reaction is also self-indicating inasmuch as `MnO_4^(-)` is STRONGLY coloured, and `Mn^(2+)` is (almost) colourless....