Redox reaction (1)

Question

What would be observed when iron (II) sulphate solution is mixed with dilute sulphuric acid and a small amount of a potassium permangante solution? Write an ionic equation for the reaction involved.

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Answer 1

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When the pale green FeSO4 solution is mixed with colourless H2SO4 solution and purple KMnO4 solution, the solution changes to yellow (or yellowish brown)*. The ionic equation is:

MnO4-(aq) + 8H+(aq) + 5Fe2+(aq) → Mn2+(aq) + 4H2O(l) + 5Fe3+(aq)

* In the resultant solution, Mn2+(aq) is colourless (concentrated Mn2+ solution is very pale pink, and thus Mn2+ solutions are usually observed to be colourless) and Fe3+(aq) is yellow (or yellowish brown). Therefore, the resultant solution is yellow (or yellowish brown.

Answer 2

Is the Potassium Permanganate...灰錳氧 that's used for medicinal purposes??? The purple crystals that makes a purple solution... . So many reactants give purple; green; brown and pink.