Investigating Osmsosis - GCSE Coursework.

Planning.

Osmosis is the diffusion of water supply molecules across a semi-permeable membrane. Diffusion is the lawsuit of molecules from an athletic field of high concentration, to an area of low concentration. So, Osmosis is the movement of water molecules from an area where there are lots of water molecules to an area where there are few water molecules.

Our aim is to uprise the concentration of dissolved substances in the cells of a murphy utilise Osmosis.

I predict that the potato in the higher concentration of sodium chloride solvent result lose an increasingly high pith of weight. I think this because the higher the concentration in salt, the more(prenominal) water particles will move through the potato cells semi-permeable membranes to search and balance the salt concentration. For example, if you placed a larger mend of potato into a beaker of an almost 100% salt solution; the potato would completely shrivel up because it would lose on the whole of the water molecules to the area of high concentration during Osmosis.

The range of divers(prenominal) concentrations of salt and water solutions we are intending to use in establish to find the concentrations of dissolved substances in the cells of a potato are:

-0% (water)

-0.5%

-1.0%

-1.5%

-2.0%

-2.5%

-3.



0%

The equipment that we are going to use for this experiment are:

- sevensome rill tubes

- A test tube holder

- Weighing scales

- Knife

- Clingfilm

- Pins

- A potato

Method:

Firstly, we will cut out 21 small pieces of potato all in the same size. We will then chuck the different concentrations of salt water into seven different test tubes; about a quarter of the test tube will be filled, just enough to cover three pieces of the potato. Next, bingle piece of potato will be weighed (and this weight will...

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