The purpose of this experiment is to observe the solubility of substances in water,
measure the effect of various factors on solubility rate, prepare a supersaturated solution,
and observe how water reacts as a reaction medium.
6 medium-sized test tubes
8 small-sized test tubes
Test tube rack
Sodium hydrogen carbonate
Sodium sulfate (irritant, hygroscopic)
Ethanol (flammable, toxic)
Finely ground sucrose
Naphthalene (flammable, suspected carcinogen)
Glycerol (irritant, hygroscopic)
1. Prepare a boiling water bath, filling a 250-mL beaker with hop tap water and placing a
ring support around the beaker for stability. Heat using a hot plate.
2. Obtain 8 small-sized test tubes and place in test tube rack.
3. Transfer 1 mL of distilled water to each tube using a graduated cylinder. Then add the
following to the labeled tubes:
Tube 1: sodium sulfate
Tube 2: barium sulfate
Tube 3: finely ground sucrose
Tube 4: naphthalene
Tube 5: urea
Tube 6: ethanol
Tube 7: vegetable oil
Tube 8: glycerol
4. Thoroughly mix contents of each tube and record observations of each solution/
5. Discard contents 2, 4, and 7 in labeled containers. Pour contents 1, 3, 5, 6, and 8 down
6. Assemble 6 clean, dry, small test tubes labeled 1-6.
7. Transfer 5 mL of distilled water into each tube. Place tubes 3-6 in boiling-water bath.
8. Testing one tube at a time, add solutes below to the tubes. Determine time it takes for
sucrose to dissolve. Begin to time each system as soon as you add the sucrose. Stir
contents of tubes 2 and 4, but do not stir contents of tubes 1, 3, 5, and 6.
Tube 1: lump sucrose, unstirred, room temperature