Chemistry 1311

Experimental Summary: Experiment # 2

1. Grab an "unknown" and a piece of filter paper with dimensions of 19 cm long and 11 cm wide. With a pencil, draw a line about 1 cm from the edge of the 19 cm side of paper. Mark the line every 2cm with a vertical dash; make sure you start the dashes 1.5 cm from the end of the line.

2. Label the dashes of the line as follows: Ag+, Co2+, Cu2+, Fe3+, Hg2+, Known, Unknown, Unknown.

3. In separate micro test tubes, place two or three drops of 0.1 M solutions of AgNO3, Co(NO3)2, Cu(NO3)2, Fe(NO3)3, Hg(NO3)2. One compound to one test tube.

4. In a sixth micro test tube put two drop of each of the following solutions: Ag+, Co2+, Cu2+, Fe3+, Hg2+. Swirl the solutions together until they are well mixed. This is our KNOWN solution, since it contains all of the cations.

5. Dip the applicator (which will be given to you by your instructor) into one of the colored solutions and lightly touch (just for a few seconds) the applicator to a found piece of filter paper. The liquid from the applicator will forma spot on the filter paper. Practice making spots of the same size until you are consistent.

6. Dip the applicator into distilled water and then lightly touch the filter paper to clean the applicator. Continue this process until all the liquid in the tube is gone.

7. Repeat step 6.

8. Dip the applicator into one of the cation solutions and make a spot on the filter paper that you drew on. The spot should be placed on the line and dash that is marked for that specific cation. Clean the applicator twice

9. Repeat step 8 until all of the cations, unknown, and known labeled on the filter paper are marked with a spot. Make sure to clean the applicator between each solution.

10. Dry the filter paper by lightly waving it in the air or by holding it in front of a hair dryer/heat lamp set on low.

11. Make 3 more spots of the unknown and known on top of the original spot on the filter paper. Dry each spot before making another.

12. From the reagent shelf, draw a15 mL of eluting solution (contains HCL, hydrochloric acid, ethanol, and butanol). Pour this solution into a 600 mL beaker and cover the beaker with a watch glass.

13. When all the spots on the filter paper are dry, put a 4-5 cm piece of Scotch tape on the upper end of the left edge of the paper (half of the tape should be on the paper).

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