Separation and Recrystallization

[Metal Displacement]

1. Pour 150ml of water into a beaker and add 3 scoops of copper(II) sulfate (CuSO4).

2. Stir thoroughly with a glass stirring rod.

3. Add 2 scoops of iron filings to the solution.

4. Observe the changes in the beaker over time.

5. Pour the solution through a funnel to filter the contents.

6. Result: As iron transfers electrons to copper ions, metallic copper precipitates. The solution changes from a copper sulfate solution to a mixed solution with a decreased concentration of Cu2+ ions.

[ECrystal Growth via Solubility Difference]

1. Place a beaker on a scale, tare it to zero, and add 150ml of water and 90g (or ml) of copper(II) sulfate.

2. Prepare a second beaker with the same amounts of water and copper(II) sulfate.

3. Place one beaker on a hot plate and insert thermometers into both beakers to measure their temperatures.

4. Stir both solutions thoroughly using a glass stirring rod.

5. Turn on the hot plate to heat the solution.

6. Suspend a seed crystal tied to a wooden stick into the beaker.

7. Cover the beaker with filter paper and wait for the results.