Reduction-Oxidation Titration

Reduction-oxidation Titration Audrey Chojko-Bolec Matt Brown 02.17.12 Tuesday AM, Group A6 Purpose Use oxidation-reduction titration with grand permanganate (KMnO4) reply to analyze an outlander Iron II (Fe2+) event. Theory Redox titration is a type of titration based on a redox do between the analyte and titrant in the answer (Burk et al. 2011). In lay to footfall the iron content of an unknown iron sample, redox titration hobo be performed with Fe(II) solution and patternized potassium permanganate solution. In this outcome the analyte of the reaction is Fe(II) and the titrant is (KMnO4). In order for redox titration to proceed; no side reaction ignore occur, if the solution is non totally acidic then neutral solutions would cause it to set off MnO2 (Burk et al. 2011). A satisfactory indicator needs to be met to mention the revoke pinnacle (Burk et al. 2011). It also needs to have a richly rate of reaction such that when end point is reached it is unornamented so no extra titrant is added to the mixture (Burk et al. 2011). At last, the reaction mustiness be thermodynamically spontaneous comely in order for the stoichiometric calculations to be used validly (Burk et al. 2011). KMnO4 cannot be used as a original stock(a); this is because it is not stable in the presence of air. It oxidizes sporadically to MnO2.

For this reason, the primary standard used is sodium oxalate, Na2C2O4. The standardization of of KMnO4 solution with Na2C2O4 is as follows: Oxidation: Na2C2O4?2Na++2CO2+2e- Reduction: KMnO4+8H++5e-?K++Mn+2+4H2O And the boilers suit equilibrize equation: 16H++5Na2C2O4+ 2KMnO4?10Na++2CO2 These reactions are the rmodynamically spontaneous, but the net ca! rdinal is susceptible to a side reaction and it is by nature rattling kinetically slow (Blandamer et al. 1998). The MnO2 present in the reaction in KMnO4 must be filtered to remove it because it interferes with the standardization. After KMnO4 has been standardized, Fe (II) can be titrated with KMnO4. Two of the side...If you want to get a beat essay, order it on our website: OrderEssay.net

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