Purpose:

(1) To familiarize the students with the physical properties of both the traditional deicer, sodium chloride, and the newly marketed organic material, ICE-BANTM. (Steps 1-6)

(2) To compare the freezing temperature of the Ice BanTM /salt mixture with ice water (Steps 7-9).

Materials for each group of 3-4 students:

One small beaker (50 ml) of Ice Ban TM
One small beaker (50 ml) of table salt
Two 200 ml (or similar sized) beakers
One teaspoon
One graduated cylinder or measuring cup
One thermometer (optional)
Enough ice (ice cubes or crushed ice) for one 200 ml beaker per group

Procedure

1. Observe the sodium chloride (table salt) and record its physical properties in the Data Table.
2. Observe the Ice Ban TM and record its physical properties.
3. Add 120 ml (4 oz) of water to a both beakers.
4. To one beaker, add 2 level teaspoons of the salt. Stir for 30 seconds.
5. To the second beaker, add 2 level teaspoons of salt and 2 teaspoons of Ice Ban TM and stir for 30 seconds.
6. Record your observations for each mixture in the data table.
7. Add a 100 ml of ice cubes to the beaker containing the Ice Ban TM/salt mixture and stir with teaspoon for 1 minute.
8. Using the thermometer, take the temperature of the Ice Ban TM/salt mixture and record. Make sure to leave the thermometer in the beaker at least 1 minute for an accurate reading.
9. Rinse out the salt water beaker and add 120 ml of water and 100 ml of ice cubes. Stir for 1 minute and record the temperature.