The average freezing times were as follows: pure water froze first in 95 min., the .6mL group froze in 120 min., the 2.5mL group froze in 125 min., and the 5mL group froze in 170 min. This means that the 5mL group has the lowest freezing point.
Conclusions/Discussion
The results confirmed my hypothesis that solutions with lower pH freeze at lower temperatures than solutions with higher pH. After researching my topic, however, I realized that salt water, pH 7, also froze at a lower temperature than pure water.
To investigate this I repeated the process but used 2.5mL of salt and sugar dissolved in two different beakers of 200mL of water. I placed these as well as a beaker of pure water and a beaker with 2.5ml citric acid solution in the freezer. I discovered that all the solutions had lower freezing points than water. My conclusion is anything dissolved in water changes its freezing point.
This project is to find out whether or not pH can change the freezing point of water