This is the freezing point of ice. Students then add 10 grams of antifreeze to the 90 grams of ice in the cup and measure the freezing point of the 10-percent antifreeze solution by recording the lowest temperature reached. Record the freezing point in data tables. Record the results on the chalkboard or the overhead. Safety glasses and aprons should be worn at all times in the chemistry laboratory.
Biodegradable antifreeze is recommended as many of the disposal problems are eliminated.
Another safe alternative substance with the same density as toxic antifreeze, add 2.5 mL Karo syrup to 7.5 mL propylene glycol. The use of boiling chips will help prevent super-heating. Dispose of all chemicals properly. See Flinn Chemical Catalog. Skills Development Lab Density of Anti-freeze water solutions Density is a characteristic property of matter.