Essay about Determination of the Composition of Cobalt Oxalate Hydrate

1041 WordsJun 17, 20135 Pages
Determination of the Composition 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. Procedure The powdered cobalt oxalate hydrate was weighed to about 0.3 g and placed in a pre-weighed crucible. The crucible and the cobalt oxalate were then heated until the cobalt oxalate decomposed into a stable, black solid, or Co3O4. Once the crucible was sufficiently…show more content…
|trial one |trial two | |Mass of cobalt oxalate hydrate |.3012g |.3027g | |Mass of residue (Co3O4) |.1777g |.1752g | |Percent Co in Cobalt Oxalate Hydrate |43.33% |42.509% | |Average percent |42.92% | | | | | |Standardization of KMnO4 Solution | | |Concentration of Standard Na2C2O4 |.1mol/L | |Volume of Na2C2O4 dispensed |15.0mL | |Volume of KMnO4 required |34.3mL | |Molarity of KMnO4 solution |.0175 mol/L | | | | | |Determination of Oxalate | | | |Mass of cobalt oxalate |.3091g |.3031g | |Volume of KMnO4 used |38.6mL |37.1mL | |Percent oxalate in cobalt

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