Oxalate Lab Essay - 609 Words

Dr. Hjorth-Gustin Chemistry 201 Lab November 8th, 2010 Synthesis and Analysis of Iron(III) Oxalate Complex Discussion 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. Part 1 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 readily bind to it. Hydrogen peroxide is the oxidant of choice: 2Fe2+ (aq) + H2O2 (l) + 2H+ (aq) --- 2Fe3+ (aq) + 2H2O (l), in acidic solution. The oxalate ion is then free to coordinate to the Fe3+ ion, forming a†¦show more content†¦Part 2 of this experiment invoked the use of redox titrating to determine the oxalate content (C2O42-) of the salt. An aqueous solution of the iron oxalate salt is prepared for titration, and the oxalate content is found through analysis by measuring the volume of titrant. Part 3 of the experiment utilized Spectrophotometry to determine the iron content in the iron (III) oxalate complex. The results were combined with findings from Part 1 and Part 2 to determine the empirical formula and percentage yield of the compound synthesized in Part 1. Spectrophotometry is a routine laboratory test that has the added advantage of being able to analyze multiple samples in a short amount of time. The most efficient way of determining concentration is to prepare a set of standard solutions of known concentration, record the absorbance readings at a fixed wavelength, and plot the absorbance vs. concentration data. The wavelength of 520 nm was selected for experiment Part 3 because this is the maximum absorbance for the iron (III) ion. The Beers Law Plot that was graphed came out to be linear with an equation of: Absorbance = 5.395 x 10^3(Fe^+2-Bipy) - 0.0014. The empirical formula that was determined was different from that of the â€Å"true† compound mentioned. The empirical formula determined was: K3[Fe(C2O4^-2)3] 3 H2O If had there been a better alternate method to determining the ironShow MoreRelatedEssay about Determination of the Composition of Cobalt Oxalate Hydrate1041 Words   |  5 PagesComposition of Cobalt Oxalate Hydrate Experiment 12 Robbie Kinsey Partner: Debnil Chowdhury Chem. 1312-D TA’s: Russell Dondero Sylvester Mosley February 9, 2000 Purpose The purpose of this lab was to determine the percent cobalt and oxalate by mass, and with that information, the empirical formula for cobalt oxalate hydrate, using the general formula Coa(C2O4)b.cH2O. 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