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Looking at how concentration affects the movement of water particles through a partially permeable membrane

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  • Essay length: 5348 words
  • Submitted: 11/02/2005
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GCSE Life Processes & Cells

The first 200 words of this essay...

Investigating how Concentration affects Osmosis?

Aim

Looking at how concentration affects the movement of water particles through a partially permeable membrane

Prediction

I predict that when the potato is submerged into highly concentrated sugar solution the mass will decrease. However, when the potato is submerged into plain water the mass will increase. I predict that relationship between the pure water will be linear however the relationship between the sugar solution will be a smooth curve.

Scientific background

Diffusion

Diffusion is the process by which a substance moves from a region of high concentration of that substance to a region of low concentration of the same substance. Diffusion occurs because the molecules of which substance s are made in random motion (kinetic theory). The rate of diffusion depends upon:

1. The concentration Gradient - The greater the difference in concentration between two regions of a substance the greater the rate of diffusion. Organisms must therefore maintain a fresh supply of a substance to be absorbed by creating a stream over the diffusion transported away.

2. The distance over which diffusion takes place - The shorter the distance between two

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