Osmosis. I predict that the higher the concentration of molar solution, the more the potato chip will weigh.

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Sean Sutton

Osmosis Coursework

Centre Number: 13440

Candidate Number: 0109

Osmosis

Introduction:

Over the past term we have been studying osmosis and diffusion. It is when you put a strong solution into a weaker solution such as sugar. Osmosis is described as the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. If the solutions on each side are equally concentrated then there will be no movement of water across the membrane. If the solution outside the cell has a low concentration, the cells become affected because water is flowing into them, if the solution outside the cell is of high concentration the water flows out. 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. Pure water has a molecular weight of 18 grams/mole, so its concentration is approximately 55 Molar. Osmosis is why drinking salty water could damage your body. When you put salt water in your stomach, osmotic pressure begins drawing water out of your body to try to dilute the salt in your stomach. This could cause you to dehydrate.

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Definition of osmosis:

Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.

Aim:

To see how concentration affects osmosis on a potato.

Prediction:

I predict that the higher the concentration of molar solution, the more the potato chip will weigh.

Plan:

A potato will be cut using a cork borer and knife to equal lengths; this will keep the surface area equal. Then the starting mass will be measured. ...

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