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osmopot

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Published on January 2, 2008

Author: Alfanso

Source: authorstream.com

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Osmosis and Potatoes!:  Osmosis and Potatoes! Slide2:  Osmosis is the movement of water molecules, across a partially permeable membrane, from a region of high concentration of water to a low concentration of water molecules. Text book definition Slide3:  Osmosis has the following uses: It allows plants to take in water through their roots. It is used in kidney dialysis machines to filter the blood. Slide4:  Remember!! A membrane controls what goes in and out of the cell. Permeable means it allows substances to go through it. A partially permeable membrane is a membrane with holes in it small enough for only WATER to go through it. Big molecules like glucose can not fit through See next slide… Slide5:  Water Sugar Small molecules, such as water can pass through it. Large molecules like sugar can not pass through the membrane Diagram shows the net flow of water Slide6:  The water molecules pass both ways through the membrane The overall flow (net flow) of water molecules is from a region with lots of water molecules to region of less water molecules. Lots of water molecules Few water molecules Water Sugar The water moves into the sugar - rich region to fill it up with water. The water moves as if to even up the concentration either side of the membrane. Slide7:  OSMOSIS is the movement of water molecules across a partially permeable membrane. The membrane only allows small molecules, e.g. water to pass through it. Large molecules e.g. glucose can NOT pass through the membrane. Water molecules move into the region where there are less water molecules The water acts to even up the concentration of water either side of the membrane. Slide8:  W Using the above facts you should now be able to understand what happens in the potato investigation Potato Pure Water In pure water the potato tubes swell, because water enters their cells by osmosis. What happens here? Remember, potatoes are rich in starch – which is a complex sugar. Slide9:  What happens here? Potato Sugar Solution In rich sugar solution the potato tubes shrink, because water leaves the potato by osmosis. Slide10:  If you would like to go over some of the points again , choose one of the options below. BACK TO START What is Osmosis? What is a partially permeable membrane? A partially permeable membrane Osmosis – what is actually happening? Summary Potato tubes in pure water Potato tubes in sugar – rich water

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