I take it this is 2nd/3rd year university question?
Deep purple, potassium permanganate is reduced to colourless
Charge and mass are balanced, so we know this is right.
We wish to remove the electrons, so we take the cross product,
The which I tink is balanced with respect to mass and charge. So this equation tells us that 2 equiv permanganate would oxidize 5 equiv platinum ion. The endpoint of the titration would be signalled by the persistence of the striking purple colour of
If there were
I do not particularly like this question, because they should not be asking you questions about experiments that have not been performed in the practical. I have never oxidized