Precipitate Activity

Equipment

1. safety goggles
2. triple-beam balance
3. 10 ml graduated cylinder
4. (1) ring stand
5. (2) utility clamps
6. ring clamp
7. (2) test tubes
8. funnel
9. 100 ml catch beaker
10. hot plate
11. weighing paper
12. filter paper
13. calcium chloride (CaCl₂) (1 g)
14. sodium carbonate (Na₂CO₃) (2.6 g)
15. distilled water (approx. 25 ml)

Procedure

1. Safety goggles will be worn during this activity.
2. Setup your station's 2 utility clamps so a test tube will slide in from above, but the clamp will hold the test tube's rim.
3. Pour 8 ml of distilled water into test tube #1.
4. Using weighing paper, measure 1 g of calcium chloride (CaCl₂).
5. Carefully pour the CaCl₂ into the test tube #1 (8 ml). Discard the weighing paper.
6. Pour 12 ml of distilled water into test tube #2.
7. Using weighing paper, measure 2.6 g of sodium carbonate (Na₂CO₃).
8. Carefully pour the Na₂CO₃ into the test tube #2 (12 ml). Discard the weighing paper.
9. Carefully swirl the water powder mixtures around until the powders are dissolved.
10. Observe (verify) that the powders are completely dissolved.
11. Pour the contents of test tube #2 into test tube #1.
12. Swirl a small amount of distilled water in test tube #2. Pour this rinse into test tube #1.
13. Record your observations.
14. Place a funnel in a ring clamp on the ring stand. Fold the filter paper and place in the funnel.
15. Mass a catch beaker then position it underneath the funnel.
16. When finished observing the precipitate, slowly pour the solution with precipitate into the filter funnel.
17. After the funnel has stopped dripping, use the hot plate to boil off the liquid in the catch beaker..
18. When the filter paper is dry, record the mass of the filter paper + precipitate.

Date Table:

1. _______________ mass of filter paper.
2. _______________ mass of catch beaker.
3. _______________ mass of filter paper + precipitates.
4. _______________ mass of catch beaker after water is boiled off.

Observations: