How to balance this redox reaction?
We use the method of half equations. The difference in oxidation numbers is accounted for electron transfer.
And permanganate ion,
And we adds
The which, I think, is balanced with respect to mass and charge. But don't trust my arithmetic.
What would we see in this reaction? The deep purple colour of permanganate would dissipate as it reacts to give almost colourless
Why did I add
See here and links for more examples of redox equations.