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Investigate how osmosis affects the weight of potato strips.

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  • Essay length: 2156 words
  • Submitted: 29/01/2004
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GCSE Life Processes & Cells

The first 200 words of this essay...

Osmosis Investigation

Aim

To investigate how osmosis affects the weight of potato strips.

Scientific Information

Diffusion occurs when there is a high concentration of molecules in one place and a low concentration in another. This difference in concentration is known as a Concentration Gradient. Osmosis is a type of diffusion when water molecules move from a high sucrose concentration to a low sucrose concentration through a semi-permeable membrane.

A cell membrane surrounds all cells. A membrane is very thin and forms a boundary between cells and their surroundings. Cell surface membranes control the amount of molecules moving in and out of the cell. They are partially permeable, which means they only allow small molecules through like water, oxygen and carbon dioxide and do not let bigger molecules pass through.

The diagram above shows how small water molecules will pass through visking tubing but bigger molecules will not pass through. The water molecules will go to a more concentrated solution but because the sugar will not pass through the visking tube, the water will try and balance out the molecules present in the water. The visking tubing will then expand to allow more water

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