All the method is referred to the sheet given. In order to dilute1.0 mol dm-3 of sucrose solution given to produce 0.2 mol dm-3 of sucrose solution, 0.3 mol dm-3 of sucrose solution, 0.4 mol dm-3 of sucrose solution and 0.5 mol dm-3 of sucrose solution, the formula below is used ;
M1V1 = M2V2
For example:
To produce 0.2 mol dm-3 of sucrose solution with volume of 20cm3
M1 (initial concentration of sucrose solution) = 1.0 mol dm-3
V1 (initial volume of sucrose solution) = ?
M2 (final concentration of sucrose solution) = 0.2 mol dm-3
V2 (initial volume of sucrose solution) = 20 cm3
M1V1 = M2V2
mol dm-3)V1 = (0.2 mol dm-3)(20 cm3)
V1 = (0.2 mol dm-3)(20 cm3)
(1.0 mol dm-3)
V1 = 4 cm3
RESEARCH QUESTIONS
Does verifying the concentration of sucrose solution would affect the length of potato strips and apple strips after 125 minutes?
Does the volume of the sucrose solution affected?
HYPOTHESIS
If the concentration of the sucrose solution is high, which is a hypertonic concentration, the length of potato strips and apple strips will decrease because the water molecules moved out from the potato and apple tissue to the sucrose solution. This causes a decrease in the length of potato and apple strips. Thus, the potato and the apple strips become flaccid. The volume of the sucrose solution will increase simultaneous due to the decreased of potato and apple lengths.
If the concentration of the sucrose solution is low, which is a hypotonic concentration, the length of potato and apple strips size will increase and becomes turgid because the water moved out of the potato and the apple cells. The volume of the sucrose solution will decrease simultaneously with the decreased of potato and apple lengths.
If the concentration of the sucrose solution is same as the concentration of potato and apple tissues, there will be no change on the length of potato and apple strips because the movement of water molecules into and out of the potato and apple cells is the same. The volume of the sucrose solution also will not changed. This called isotonic.
VARIABLES :
Independent variable :
Independent variable
Concentration of sucrose
Dependent variable
Final length of potato and apple strips after 125 minutes
Constant variable
Initial length of apple and potato strips
Initial volume of sucrose solution
Five strips of apple and potato are put in each test tube
DATA PROCESSING
CONCLUSION
If the concentration of the sucrose solution is high, which is a hypertonic concentration, the length of potato strips and apple strips will decrease because the water molecules moved out from the potato and apple tissue to the sucrose solution. This causes a decrease in the length of potato and apple strips. Thus, the potato and the apple strips become flaccid. The volume of the sucrose solution will increase simultaneously with the decreased of potato and apple lengths. The hypertonic solution for apple strips is at 0.2M and 0.3M, whereas for the potato strips is at 0.2M and O.3M also.
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If the concentration of the sucrose solution is low, which is a hypotonic concentration, the length of potato and apple strips size will increase and becomes turgid because the water moved out of the potato and the apple cells. The volume of the sucrose solution will decrease simultaneously with the decreased of potato and apple lengths. The hypotonic solution for apple strips is at 0.5M and 1.0M, whereas for the potato strips is at 1.0M.
If the concentration of the sucrose solution is same as the concentration of potato and apple tissues, there will be no change on the length of potato and apple strips because the movement of water molecules into and out of the potato and apple cells is the same. The volume of the sucrose solution also will not changed. This called isotonic. The isotonic solution for the apple strips is at 0.4M, whereas for the potato strips is 0.4M and 1.0M.
The hypothesis is accepted.
LIMITATIONS
SUGGESTIONS
Error may occur during the measurement to determine the length of potato strips.
the measurement should be repeated for at least 3 times to minimize the error in the experiment.
Error may occur while marking the level of sucrose solution due to the poor method of measuring that is by visual observation.
A more precise tool should be used to get the most precise data.
The surface of potato strips may not flat. So even though we controlled the initial length,actually the initial length are not same for each potato strips
the mass of potato strips in order to observe the changes of elongation of the potato strips in each solution to get more accurate reading as the electronic mass balance has a small uncertainty compared than using a ruler to measured the elongation.LIMITATIONS AND SUGGESTIONS
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