Investigating the Osmosis Effect in Potato Cores

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Investigating the Osmosis Effect in Potato Cores

Aim

The aim of this experiment is to investigate the osmosis effect in potato cores while they are submerged in different concentrations of sucrose solution. Osmosis will take place while the potatoes are fully submerged in the sucrose solution.

Apparatus

ľScalpel(1)
ľTile(1)
ľPr. Tweezers(1)
ľ250ml Beakers(2)
ľ100ml Water(Per Beaker)
ľ100ml Sucrose Solution
o0.2M
o0.4M
o0.6M
o0.8M
o1.0M
ľMeasuring Cylinders(2)
ľRuler (1)
ľPotato Cores(30)
ľStop Clock(1)
ľGoggles(1)

What is Osmosis?

Osmosis ¡V A type of diffusion - is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. Diffusion refers to the process by which molecules blend together as a result of their kinetic energy of random motion. Consider two containers of gas A and B separated by a partition;

The molecules of both gases are in constant motion and make numerous collisions with the partition. If the partition is removed as in the lower illustration, the gases will mix because of the random velocities of their molecules.

In time equilibrium of A and B molecules will be produced in the container. Osmosis is practically a special type of diffusion. It is the diffusion of water from where there is a high concentration of water molecules (the weaker sugar solution) to where there is a low concentration of water molecules (the stronger sugar solution).

If two solutions of different concentration are separated by a semi-permeable membrane which is permeable to the smaller solvent molecules but not to the larger solute molecules, then the solvent will tend to diffuse across the membrane from the less concentrated to the more concentrated solution. This process is called osmosis. Osmosis is of great importance in biological processes where the solvent is water. The transport of...
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