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To find the water potential of a potato cell.

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Biology Practical Assessment Aim To find the water potential of a potato cell. Theory This experiment will involve the process of osmosis. Osmosis is the movement of water molecules from an area of low concentration of dissolved stuff to an area of higher concentration of dissolved stuff through a selectively permeable membrane. More O molecules (which represent water) are moving to the right than the left because there are more X's and less O's on the right than on the left. The movement of O's will continue until both sides have equal concentrations. Equipment * 1 Potato * 1 Hole Cutter * 1 Tile * 1 Scalpel * 6 Test Tubes/Beakers * Test Tube Holder (for Test Tubes) ...read more.


Water + 0.8 moles of salt 6 40ml Water + 1 mole of salt Leaving a minute in between each one place a piece of potato into each solution. After 6 minutes all of the pieces of potato should be in a piece Test Tube/Beaker. Leave for 25 minutes, take the 1st one out and weigh again, do with the rest making sure each gets 25 minutes in their solution. Results These are the results from the experiment: Number Before Weight After Weight Percentage Increase/Decrease 1 3.01g 3.13g 3.98% 2 2.84g 2.84g 0% 3 2.99g 2.86g -4.34% 4 3.18g 2.98g -6.28% 5 3.16g 2.88g -8.86% 6 3.07g 2.75g -10.423% Conclusion The results clearly show that there is a pattern. ...read more.


The graph shows us that the water potential of a potato cell is equal when there are 0.2 moles of salt in the solution. The curve on the graph tells me that the decrease in weight is slowly slowing down; even though the concentration of dissolved stuff is getting higher in the solution. This could be because of the time I left it for or there is only so much water that can come out of the potato cells, I would have to carry on the experiment to find out. Evaluation I could of made the test fairer by drying the scales before I put my piece of potato on, as there could have been water on them from previous tests. In overall I think I got quite could results, producing a good graph. ...read more.

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