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Investigation of Osmosis

Satisfactory Essays
Investigation of Osmosis

Aim: - To investigate the effect of varying the concentration of sugar

solutions on the effect of osmosis between the solution and a potato

chip cells.

Apparatus: -

Potatoes

Watch

Sugar solutions (DI, 0.2, 0.4, 0.6, 0.8, 1Molar)

Distilled water

Mass balance

Knife

Measuring cylinder

6 petri dishes

Ruler

Prediction: - I think that the lower the concentration of the sugar

solution in the petri dish the larger the increase of the mass of the

potato will be. This is because the water molecules pass from a high

concentration to a low concentration of water molecules through a

semi-permeable membrane. The chips in higher water concentrations will

have a larger mass than in higher sugar concentrations.

My graph may look like this:

[IMAGE]

I think this is going to happen because of the following scientific

knowledge:

Scientific Knowledge: -

Osmosis is the movement of water molecules to a lower concentration of

molecules through a semi-permeable membrane. The water will move in

different ways in different solutions. This will make a chip increase

and decrease in size. After osmosis takes place the chip will become

plasmolised

In a high concentration of water the amount of sugar is low. This

could be called a weak or dilute solution.

In a low concentration of water the amount of sugar is high. This

could be called a strong or concentrated solution.

When two solutions are divided by a semi-permeable membrane the water

will move from the area of high concentration to the area of low

concentration, until both sides are equal (have reached equilibrium).

[IMAGE]

This can be seen in living cells. The cell membrane in cells is

semi-permeable and the vacuole contains a sugar solution. So when a

cell is placed in distilled water it will move across the

semi-permeable membrane into the cell by osmosis, making the cell
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