The Kinetics of the Reaction between Permanganate and Ethandioate Ions

Reaction rate of reaction between permanganate and ethylenediamine ion Chroma saturation measurement, I 1 (%) measured value, I 2 (%) Red 79.0 100 Yellow 34.5 100 Green 0 100 Blue 34.0 100 I 1 = KMnO 4 Transmittance I 2 = water permeable KMnO 4 added water (cm 3) colorimetric measurement value, I (%) I / I 0 KMnO 4 molar concentration (M) 0.0 100.0 00 0.0 0.1 74.0 0 .74 0.01 × 0.1 / 10.1 = 0 × 10 -4 0.2 39.0 0.39 0.01 × 0.2 / 10.2 = 0 × 10 -4 0.3 26. 0 0.26 0.01 × 0.3 / 10.3 = 9 × 10 -4 0.4 13.0 0.13 0.01 × 0.4 / 10.4 =

In the analysis of oxalate ion, redox titration between potassium permanganate and oxalate ion does not require an indicator. At the end point, since potassium permanganate is an oxidizing agent, it becomes oxalate ion in solution. Oxidation to carbon dioxide As a result, permanganate itself was reduced to Mn 2+, so a pale pink color was observed at the end point. The reaction that occurs is as follows. This experiment shows that iron as a transition metal can exist in various oxidation states. These oxidation states can then form multiple complexes with different ligands. The complex formed can then be analyzed using redox titration to determine the proportion of iron and oxalate in the complex.

In acidic solution, permanganate ion is reduced to manganese (2+) ion. Since the permanganate ion is purple and the manganese ion is colorless, the end point of the titration using potassium permanganate as titrant can be used as the first permanent pink color appearing in the solution it can. This titration involves oxidation of Fe 2+ ions to Fe 3+ ions by permanganate ions and is carried out in a sulfuric acid solution to prevent air oxidation of the ferrous ions. In the presence of phosphoric acid, the end point of the titration is markedly sharp. The reason is that since the Fe 3+ ion itself is yellowing, it is possible to partially hide the end point of the pink color, but when phosphoric acid is added, a colorless complex is formed with the Fe 3+ ion That is why.