Activity 4: Rates of Dissolving, and Solubility Factors
Students will develop a plan of action to investigate the effects of temperature, amount of solute, size of particles, and another factor determined by the students. These factors will be investigated for two different solutes.
The plan of action by the students should maintain all constant variables with the exception of the one being tested. The following is a sample observation chart, and the student’s charts should resemble this one.
|
Solute type |
amount of water |
temperature |
amount of solute |
crushing |
stirring |
time to dissolve |
|
sugar |
20mL |
20 |
cube |
crushed |
no |
|
|
sugar |
60mL |
20 |
cube |
crushed |
no |
|
|
sugar |
100mL |
20 |
cube |
crushed |
no |
|
|
|
|
|
|
|
|
|
|
sugar |
50mL |
20 |
cube |
crushed |
no |
|
|
sugar |
50mL |
40 |
cube |
crushed |
no |
|
|
sugar |
50mL |
60 |
cube |
crushed |
no |
|
|
|
|
|
|
|
|
|
|
sugar |
50mL |
20 |
cube |
not crushed |
no |
|
|
sugar |
50mL |
20 |
cube |
crushed |
no |
|
|
|
|
|
|
|
|
|
|
sugar |
50mL |
20 |
cube |
crushed |
yes |
|
|
sugar |
50mL |
20 |
cube |
crushed |
no |
|
The above table is for one type of solute (sugar). Students will need to create two charts with different solutes. When they perform the lab activity, the groups could be divided into 2 with each taking a different solute.