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Determination of the Composition of Cobalt Oxalate Hydrate| Chemistry Lab 1211-L|
Sheree L. Dickey|

Objective:To be able to use gravimetric analysis to determine the percentage of cobalt in cobalt oxalate hydrate as well as learning how to do a redox, titration to determine the percentage of oxalate in the compound

Equipment:
Analytical balance| 0.02 M potassium permanganate KMnO4|
Buret| 0.1 M sodium oxalate, Na2C2O4 standard solution|
Buret clamp| Litmus paper|
6M sulfuric acid, H2SO4| |

Procedure:
Heat a known mass of cobalt oxalate hydrate in a pre-weighed crucible to convert the salt to CO3O4, a black solid. Standardize 0.02 M potassium permanganate by titrating a known volume of a standard solution of 0.1 M sodium oxalate that has been acidified. Use the standard permanganate solution to titrate a known mass of cobalt oxalate hydrate. Block/McKelvy (2012). Laboratory Experiments for Chemistry 1211L and 1212L with Contributions from Georgia Perimeter Faculty 7th Edition Clarkston Campus pgs. 57-66 (Determination of the Composition of Cobalt Oxalate Hydrate)

Data:
Determination of Cobalt|  |  |  |
 | Trial 1 (g)| Trial 2 (g)|  |
Mass of crucible and cobalt oxalate| 23.8759| 23.8752|  | Mass of crucible| 23.5754| 23.5754|  |
Mass of crucible cobalt oxalate| 0.3005| 0.2992|  |
Mass of crucible and residue| 23.7294| 23.7313|  |
Mass of crucible| 23.5754| 23.5754|  |
Mass of residue| 0.1540| 0.1559|  |
% Co in cobalt oxalate| 37.60%| 38.22%|  |
Average % Co| 38.42%|  |  |
 | | |  |
Standardization of KMnO4|  |  |  |
Concentration of standard Na2C2O4| .1 M Na2C2O4|  |  |  | | | |
Final reading of Na2C2O4 buret| 10.01| 10.01| |
Initial reading of Na2C2O4 buret| 0.00| 0.00| |
Volume of Na2C2O4 solution dispensed| 10.01| 10.01| |
Final reading of KMnO4 buret| Trial 1 (mL)| Trial 2 (mL )| | Initial reading of KMnO4|...
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