Cation Unknown Identification Using Transition Metal Complexes

Topics: Thin layer chromatography, Ammonia, Rachel Pages: 4 (1172 words) Published: June 19, 2012
Cation Unknown Identification using Paper Chromatography and Transition Metal Complexes Experiment performed by Nathan Garcia, Richard Rodriguez and Christopher Mynatt* Introduction:
In this experiment, different metals were identified by using different solutions and observing color differences. Then, the relative components of the metal cation mixtures were observed using paper chromatography, and the distances travelled by the metals on the paper gave the relative identities of each part in the solution. Materials and Methods:

For the first part of the experiment, obtain and use one spot glass and add one drop of each of the five different metal cation solutions listed one through five. For best results when observing the colors of the products of the reaction, a piece of white paper was put underneath the spot glass. This was because the spot glass was clear glass, which made the colors of the products hard to see. Then, add 3 drops of HCl (6M) to each of the metal cations and observe the color of the reacted metal. After the HCl, rinse out the spot plate and fill it back with the five unknown metals (1-5). Add 3 drops of 3M NH4OH to each of the five metals and observe the change in color. Then, as with the previous experiment, add one drop of each of the five metals to the well plate after rinsing it. Add one drop of dimethylglyoxime (DMG) to each of the five metals. Observe the reaction and note color changes.

The next part of the experiment involves paper chromatography. Find a piece of paper chromatography paper and orient it to where the horizontal plane is larger than the vertical. Draw a straight line one centimeter from the bottom horizontally and one line .5 centimeters from the top. Label the top with Solution 1, Solution 2, Solution 3, Solution 4, Solution 5 and Unknown. Once this is done, use a capillary tube to spot each of the solutions onto the capillary paper in each of the labeled places that were drawn in the previous...
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