641 Words3 Pages

Aim: The purpose of this lab is to investigate the relationship between solute concentration and the movement of water through a selectively permeable membrane by the process of osmosis.
Hypothesis : my hypothesis is that the potato will shrink in size because when you put the potato in the sugared solutions the water potential outside the potato will be less than the water potential inside the potato therefore , the potato will shrink.
Variables :
1.Independent : concentration of the solution
2.Dependent :mass of the potato
3. Controlled variable:
• Temperature
• The amount of the solution
Materials :
1.4 beakers (100ml)
2. potato
3.knife
4.cork ( size 2)
5.ruler
6. Graduated cylinder (25 ml )5
7.balance
8.weight boat
9.dropper
10.forceps
11.solutions with different concentration :
• 50 ml of 0.1 of sugar concentrated solution
• 50 ml of 0.2 of sugar concentrated solution
• 50 ml of 0.3 of sugar concentrated solution
• 50 ml of 0.4 of sugar concentrated solution
• 50 ml of 0.5 of sugar concentrated solution
• 50 ml of distillated water.
Procedure: as the paper attached.
Table: the mass of the potato before and after its placed in the solution.
Number of potato The solution Mass of the potato before osmosis Mass of the potato after osmosis
1 0.1 of sugar concentrated solution 0.44 kg 0.43 kg
2 0.2 of sugar concentrated solution 0.48 kg 0.42 kg
3 0.3 of sugar concentrated solution 0.49 kg 0.44 kg
4 0.4 of sugar concentrated solution 0.50 kg 0.44 kg
5 0.5 of sugar concentrated solution 0.44 kg 0.44 kg
6 distillated water 0.41 kg 0.43 kg
Graph: in the attached paper.
Data processing:
1. Percent change in mass :( final mass – initial mass/ initial mass)*100.
Percent change in mass for potato 1 =0.43-0.44/0.44*100=-2 %
Percent change in mass for potato 2 =0.42-0.48/0.48*100=-12 %
Percent change in mass for

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