1. Place approximately 0.1 g of solid iron chloride (FeCl3) into each of two
dry, small (10-cm) test tubes.
2. Add 30 drops of distilled water to one of the solid samples prepared in
Step 1, and shake until the solid dissolves completely. Record the color of the resulting solution in a Table under the ‘‘Unmelted Sample’’ heading.
3. Put 10 drops of the solution prepared in Step 2 into each of two other
empty test tubes. This gives you three test solutions.
4. Add 2 drops of 0.1 M silver nitrate (AgNO3) solution to one test solution. Mix well, and record the results in a Table under the ‘‘Unmelted
Sample’’ heading.
5. Add 2 drops of 0.1 M ammonium thiocyanate (NH4SCN) solution to
the second test solution, mix well, and record the results.
6. Add 2 drops of 0.1 M potassium ferrocyanide (K4Fe(CN)6) solution to
the third test solution, mix well, and record the results.
7. Heat the other solid sample of FeCl3 very gently until it just melts. This
is best done by moving the test tube back and forth through a low
burner flame. Do not overheat the sample.
8. Allow the melted sample to cool for about 5 minutes. The sample
might remain in the liquid form even when cool. You have now
changed the sample by melting it and letting it cool.
9. Add 30 drops of distilled water to the cool sample and shake until the
sample dissolves completely. Note and record the color of the resulting
solution in a Table under the ‘‘Melted Sample’’ heading.
10. Test this solution made from the melted sample the same way you did
the solution made from the unmelted sample by repeating Steps 3–6.
Record the results of the tests in a Table.
