Investigate the Cell Sap Concentration of Solute in a Potato Chip using Osmosis

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Investigate the Cell Sap Concentration of Solute in a Potato Chip using Osmosis

Aim

The aim of the experiment is to investigate the cell sap concentration of solute in a potato chip using osmosis and produce a figure informed by the investigation as to what this is.

Background Information

A factor that effects how much water moves into a cell is the solute concentration within it. Water moves in and out of cells by diffusion, this diffusion is called osmosis. Osmosis is the diffusion of water molecules from a place with a high water potential or high concentration of water to a low water potential or low concentration of water. If a solution has a high water potential this means it is weak or dilute solution so it only has a small
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Cells that have a high concentration of salt (e.g. magnesium) keep hold of their salts and do not let them diffuse out into a low concentration such as the surrounding environment for example. They can even take in more salts against a concentration gradient by using protein carrier cells found in the cell membrane.

The protein carrier cells open up, get some more salts close and then open up again putting the salts into the cell, osmosis can never work like this because active transport goes against the concentration gradient when osmosis always goes along or down it. Turgidity occurs when the water has passed from a high water potential with a weak solution to a low water potential with a strong solution. As the cell fills with water it swells up and pushes the cytoplasm against the flexible cellulose cell wall. If most of the cells in a plant are turgid the plant will be very sturdy and rigid. At the other extreme, if the contents of a cell has a higher water potential than the outside of the cell for example, the soil. Then the water will diffuse out of the cell by osmosis into the surrounding soil because it is moving from a high potential to a low potential, as the vacuole shrinks the cell becomes flaccid. If the cell loses a lot of water the cytoplasm is pulled away from the cell wall and the cell shrivels up, it becomes plasmolysed and can

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