Gcse Science Coursework Osmosis
Apparatus: - 125ml of 1ml sodium chloride solution.
Osmosis is a type of diffusion involving water molecules and a semi-permeable membrane.
In osmosis, each individual cell is surrounded by a cell membrane.
The cell membrane allows small molecules to pass through it, but not large ones.
I will be doing this investigation on potato chips in different concentrations of salt.
If the potato is placed into distilled water, the concentration of water outside of the cell will be greater than the concentration of water inside the cell.
This is because there are more molecules that are exposed to diffuse in comparison to the molecules in a smaller surface area.
– The rate of osmosis will faster as the solution is more concentrated.
This is because there are only a few particles to collide with the potato chip and fewer particles will have to diffuse into the potato to equalise the concentration of the solution and the potato inside it.
When the potato chip is inside a water concentration, which is lower than in the chip, water will enter through the semi-permeable membrane into the potato chip.