Method

This is the method I used today when conducting my experiment:

All necessary equipment was obtained from shopping centres and the household. 2.5 kilograms of sugar was split into parts of 1.5 kilograms and 1 kilogram and dissolved in 2 litres of H2O, split into parts of 1.5 litres (Solution C) and 0.5 litres (Solution A) respectively and 150 millilitres of each of these solutions was poured into measuring cylinders. Two more solutions were then made from these two basic solutions. Solution B was created from 75 millilitres of Solution A and 75 millilitres of Solution C and Solution D was created from 75 millilitres of Solution C and 75 millilitres of H2O. As a control, 150 millilitres of plain water was also used. Solutions A-D and the control were then poured into plastic cups. The plastic cups were then labelled.
The temperature of Solution A was measured using a probe thermometer and recorded.
The cup was then placed into a freezer of temperature -20OC. The temperatures of the control and of Solutions B-D were then measured and recorded and the cups placed in the freezer.
This process was repeated every 15 minutes until the solutions either froze or became too cold for the thermometer to measure. The equipment and materials were then cleaned up. The experiment was repeated.