To start the lab we set up 6 test tubes on a test tube rack. We then filled three test tubes a third full with water, and the next three test tubes a third full of paint thinner. We then added salt to a test tube filled with water and a test tube filled with paint thinner. We then proceeded to do the same with sugar iodine crystals.
After putting a stopper on each of the test tubes we inverted them one by one to see which substances dissolved. We observed that salt and sugar dissolved in water but the iodine crystals did not, and that in paint thinner the iodine crystals did dissolve while the salt and sugar did not. using these observations we learned than polar substances only dissolve if the solvent is polar and that non polar substances only dissolve if the solvent is non polar. To prove this more we mixed water after it had dissolved salt with paint thinner after it dissolved iodine. The result was the two substances not mixing and the paint thinner staying on top and the water staying on the bottom.
With our new found knowledge we mixed water with glycerin. Both being clear substances it was hard to see if glycerin was dissolved in water, but knowing that glycerin is polar and water is polar we know that glycerin did dissolve in water.
The polar chemical structure of glycerin:
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