Who can explain this technique that i have found in an Article please ?
''The percentage of Mn3+ and Mn4 ions in our samples is tested by the conventional chemical technique. First, we have dissolved our powder in oxalic acid dishydrate (H2C2O4, 2H2O) and concentrated sulfuric acid (H2SO4). Then, the resulting solutions were titrated by potassium permanganate (KMnO4). The results showed that the experimental values of manganese ions concentration (for example x = 0.00) (Mn3+ (%) = 70.4 and Mn4+ (%) = 29.8) are close to the theoretical ones.''
Mn3+ forms a complex with oxalate, but KMnO4 only reacts with Mn3+ to oxidize it to Mn4+. They find the amount of KMnO4 consumed in the proces, then they determine the Mn4+ as the difference Mn(total)-Mn3+. Do they say how they get the total Mn? ICP?
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