By Adrienne R
The purpose of this experiment is to determine if salt or the amount of salt affects the freezing point of water. To preform this experiment, the plastic cups were first labeled one to five. 118.3 of the distilled water was poured in to each of the five cups. Two point five grams of salt was placed in cup two,five grams of salt was placed in cup three, seven point five grams of salt was placed in the fourth cup, and ten grams of salt was placed in cup five. The cups were placed in the freezer with one of the indoor\outdoor thermometers in each of them. The cups were checked every five minutes to record their temperature and to see if they formed ice.
In all three trials, cup one which contained no salt, formed ice first. But, cup five, the cup with the greatest amount of salt, did not always form ice and was not always the last to form ice. What was interesting was cup five got the coldest quickest.
These results occurred because the freezing point of most liquids can be lowered by adding another substance. So, salt water freezes at a lower temperature.
One problem that occurred during the experiment was that the conductor wires that lead to the thermometer gauge outside of the freezer had to be taped to the roof of the freezer to keep them in place. To expand this project, other types of salt or water could be tested.