Biology Coursework Osmosis - Conclusion

 

If the osmotic potential of the solution is the SAME as the water potentialof the cell, which in my case, is where the sucrose and distilled water bothhave the concentration of 0.5M. The solution is called isotonic.

HYPOTHESIS

From my background research, I predict that the more concentrated thesolution (the more sucrose it contains), the lower the osmotic potential is. The plant cell (in this case potato cell) would become flaccid, as water hasmoved out of the cell causing the mass to have decreased. Asconcentration of sucrose decreases, and the concentration of dilute waterincreases, the mass of the potato cell will become turgid and strong. It willgain mass as water diffuses into the cell.At concentration 0.5M, the solution will be isotonic; therefore, the % masschange should be at zero as no net osmosis should occur, therefore nowater should diffuse in or out of the cell, and so should not affect the massof the cell at all.I have planned a simple procedure in order to carry out this investigation:Apparatus/Equipments:

Sucrose Solution and Water (two beakers to hold them)

Weighing machine

Year 11 Biology Coursework 3

In an isotonicsolution, no netosmosis occurs. The cell is notplasmolysed, butit’s neither fullturgid either.For Example:Water potential of cytoplasm=- 50Osmotic potential of solution=- 50

(This is the osmotic pressure)

Biology Coursework: The Effects Of Osmosis On A Potato Chip In Sugar Solution

Biology Coursework: Effect of Sugar Solution on Potato Chips

Planning

Before planning the experiment, I will research osmosis, so that I can make predictions. This will help me to discover how to make this investigation fair and safe. Planning ahead will help me find out the order in which to carry out the experiment. This should lead me to good results at the end of the experiment.

Hypothesis

Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. When a potato is placed in water, the cells will expand by gaining weight depending on the concentration levels of the solution. When the concentration of the water is lower, more water molecules are allowed to pass through the potato cell. This causes the potato to gain weight and expand. If the concentration levels of the solution are higher, the cells will lose water and cause the potato to lose weight and therefore shrink.

Prediction

I predict that when the lower the concentration of sugar solution in the water, the more the potato will expand by osmosis. When the concentration of water is identical to the concentration of the potato cell, there will be no increase or decrease in weight. This is because the amount going into the cell will be the same as the amount going out. As soon as the water concentration becomes higher, the cells will shrink because more water will be leaving the cell than entering it.

In distilled water alone, I predict that the water in the potato will be more concentrated. Because of this, the water should transfer from the solution to the potato, and the potato will gain weight.

In the 0.2 molar solutions, the substances will be very similar in concentration. There should be little change to the size and weight of the potato.

When the potato is placed in 0.4 molar solutions, the substances will still be very similar but the concentration of the water solution should be slightly greater to that of the potato. This will cause the potato to shrink slightly.

As the molar solutions get higher, the water will transfer more and more from the potato to the water solution, therefore decreasing its size and weight. The most extreme shrinking should occur when the potato is placed in...

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