Jill Buganski
Chem 1290-012
Experiment 236 Write Up
25 January 2011
Experiment 236 Lab Report
Purpose
The purpose of experiment 236 is to test the solubility of different solutions in water.
Another purpose is to determine the effect of certain factors, like temperature or mixing, and
solubility, and finally prepare a supersaturated solution.
Procedure
For this procedure, a significant number of supplies are needed. They are listed as
follows:
- 8 small test tubes
- One large test tube
- Test tube rack
- 250 mL beaker
- Hot plate
- Ring stand
- Test tube holder
- Chemicals
Various chemicals were also used in this experiment. Sodium sulfate, barium sulfate, sucrose,
naphthalene, urea, ethanol, vegetable oil and glycerol were the chemicals use to test solubility in
water. For solid chemicals, the amount equivalent to a small pea was used. For liquids, 10 drops
were added to each test tube. The solubility of sodium thiosulfate in water was also tested in part
four of the experiment. In part five, two chemicals were mixed together, sodium hydrogen
carbonate and solid citric acid, then water was added to observe how water works as a reactor.
The condensed procedure is attached.
Data
The data and observations for experiment 236 are attached.
Discussion
As a result of all of the solubility tests, conclusions were able to be made about the
chemical formula and whether or not they would be soluble in water. In this lab, an unsaturated
and saturated mixture was observed as well. Factors like temperature, state of the solid, and
amount of compound added to water were used to determine how those certain factors affect
solubility.
Error
In this lab, one of the errors that could occur would be not completely drying out a test
tube before preforming an experiment in it. Especially in the case of mixing the sodium
hydrogen carbonate and citric acid solids together. If water is still on the insides of the test tube,
a reaction will begin to occur, or the solids will stick to the spots that contain water. Another
error would be forgetting to time part three in the lab. Forgetting to time or forgetting the time
that the reaction took place will effect your overall results in comparing the solubility of sucrose.
Conclusion
The experiment set out to test the solubility of different substances in water. Each
chemical stated above was tested for its solubility in water. By performing this experiment,
solubility for different chemicals were observed. Another significant discovery in this lab was
how water is used to facilitate a reaction. After this lab, the significance of water in reactions has
become very clear and evident.