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Osmosis Investigation

Satisfactory Essays
Osmosis Investigation

Aim

To find out what type of things affect the rate of osmosis in plants

for example, temperature and time.

I will do this using a piece of potato submerged in different amounts

of sugar solution and record any changes in mass.

Prediction

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Osmosis is the movement of water molecules across a partially

permeable membrane from a region of high water concentration to a

region of low concentration. Therefore I predict that the potato in

the highest sugar solution will have the lowest water concentration

and the weakest sugar solution will have the highest water

concentration. This is due to the fact that in high sugar solutions

the water leaves the cells due to osmosis making the potato lighter.

Background

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Plant cell Animal cell

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Osmosis:

Osmosis is just a form of diffusion it means the movement of water

molecules across a partially permeable membrane from a region of HIGH

water concentration to a region of LOW water concentration.

Osmosis makes plant cells swell up if they are surrounded by a weak

solution and they become turgid. This is useful to the plant cells as

it provides support.

The cells ill become turgid because the plant cells will draw water

into themselves by osmosis. The contents of the cell start to push

against the cell wall, therefore giving support to the plant tissues.

Without the turgid pressure the leaves would not be supported.

Apparatus

Potato- to get pieces of potato from it

Cork borer-to get pieces of potato out of the main potato

Measuring cylinder-to measure the amount of liquid for the potato

pieces to be submerged in

Beakers-to use for the liquid and submerge the potato pieces in

Scales-to weigh the potato pieces after a set amount of time in the

solutions

Stop clock-to record the amount of time the potato pieces are left in

the solutions for

Sugar solutions-0.0, 0.2, 0.4, 0.
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