Synthesis and Component Analysis of an Iron (Iii) Oxalate Complex

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Experiments 4A-C: Synthesis and Component Analysis of an Iron (III) Oxalate Complex My Name TA, Section B## Work Performed on 10/23, 10/30, & 11/4, 200# Report due Tuesday, November ##, 200# 1. Abstract This experiment initially involved the synthesis of an iron (III) oxalate complex with the general formula Kw[Fex(C2O4)y]·zH2O. The variables x, y, and z were determined through the duration of the entire experiment. From 1.2000g of Fe(NH4)2(SO4)2 were synthesized 1.1###g of K3[FeIII(C2O4)3]·3H2O, owing for a percentage yield of 74.###%. A percentage yield of 11#.##% was also calculated, had the final product been K[FeIII(C2O4)2]·2H2O. This value was rejected because experimental errors are never to exceed theoretical values,…show more content…
The redox components occur in pairs, with one species (the reductant) giving up its electron(s) to be taken up by the other species (the oxidant). 4A involves the synthesis of an iron (III) oxalate complex. The iron is first presented in its Fe2+ form, so it must first be oxidized to Fe3+ before the oxalate ion will bind readily to it. Hydrogen peroxide is the oxidant of choice: 2Fe2+ (aq) + H2O2 (l) + 2H+ (aq) 2Fe3+ (aq) + 2H2O (l), in acidic solution. (1) The oxalate ion is then free to coordinate to the Fe3+ ion, forming a complex of Fe(C2O4). The oxalate ion is the conjugate base of the weak oxalic acid, H2C2O4. In lab, careful attention is paid to the maintenance of the H2C2O4-C2O42- equilibrium, as only the oxalate ion is capable of coordinating. This is done through the addition of H2C2O4 and the soluble K2C2O4 – only the oxalate anion is of concern: (2) The complex may then be synthesized – the general reaction equation is: aFe(NH4)2(SO4)2·6H2O + bK+ + cC2O42- + dH2C2O4 eK3[Fe3+(C2O4)3]·3H2O (3) The complex is then precipitated out and rendered into a crystalline form with ice (decreased temperature results in decreased solubility) and ethanol (a polar solvent; the nonpolar target product will have limited solubility in ethanol because of the violation of the like-dissolves-like rule). The most likely synthesis products are

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