1. Using a marking pencil, number four test tubes 1 through 4 and stand them on a test tube rack.
2. Measure out 5ml of 0.1M FeCl3 and pour it into a 100-ml beaker. Add 5ml of 0.1M KSCN to the same beaker. Dilute the content of the beaker w/ distilled water until the solution is a light reddish-orange color. Divide the solution equally among the four test tubes. Set test tube 1 at one end of the rack to be used for color comparison.
3. Using a dropper pipette, add 0,1M FeCl3 drop by drop into the solution in test tube2 until a color change occurs. Record your observation in part A of “Observations and Data.” Rinse the pipette.
4. Repeat step 3, but instead of FeCl3, add the following solutions drop by drop to the test tube indicated. Rinse the pipette after each use. Test tube 3 0.1M KSCN. Test tube 4 0.1M KCl
5. Discard the solutions. Wash and rinse the test tubes and invert them in the rack to drain
6. Using a marking pencil, number four test tubes 5 through 8. Stand them on the rack.
7. Measure out 5 ml of 0.1M K2CrO4 into test tubes 5 and 6. Rinse the graduates cylinder and measure out 5 ml of 0.1M K2Cr2O7. Divide this equally between test tube 7 and 8.
8. Using a dropper pipette, add 0.1M HCl drop by drop to test tube 5 until the color changes.
9. Repeat step 8 with test tube 6. As soon as the color changes, rinse the pipette and use it to add 1.0M NaoH drop by drop until the color changes again.
10. Using the pipette, add 1.0 M NaOH to test tube 7 until color changes.
11. Repeat step 10 with test tube 8, As soon as the color changes, Rinse pipette and use it to add 1.0 M HCl to the solution until the color changes again.