10Fe(NH4)2(SO4)2 + 8H2SO4 + 2KMnO4 → 5Fe2(SO4)3 + 10(NH4)2SO4 + 2MnSO4 + K2SO4 + 8H2O
Diammonium-iron(II) sulfate react with sulfuric acid and potassium permanganate to produce iron(III) sulfate, ammonium sulfate, manganese(II) sulfate, potassium sulfate and water. Sulfuric acid - diluted solution.