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Investigate osmosis with different concentrations of sucrose solutions on potato chips.

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Introduction

Aim: To investigate osmosis with different concentrations of sucrose solutions on potato chips. Apparatus: > Test tubes �6 - five solutions > Knife - peel and cut potato > 25cm measuring cylinder - measure solutions > Distilled water - part of experiment > Sucrose solution - part of experiment > Potatoes - part of experiment > Tissue paper - dry potatoes after Osmosis takes place > Balance - weigh potatoes > Potato slicer - cut potatoes accurately > Micrometer - measure cubes > Marker pen - label five test tubes > Test tube rack to hold the test tubes. > Cutting tile - cut potato on > Goggles - safety Diagram: Method: > First, collect and set up the equipment. (See diagram) > Peel and wash potatoes. Cut out two slices from the middle of the potato the same width as each other > Use the potato cutter to cut the potato into chips. Find 12 chips about the same size. > Cut and measure potatoes accurately so they have the same surface area. ...read more.

Middle

I predict that between 0.3 and 0.4M sucrose solution the cell with nether increase or decrease in mass and volume and won't become either turgor or plasmolysed. Scientific theory: Osmosis: Osmosis is the movement substances through a semi-permeable membrane. The cell membrane allows some substances through and stops others. In general particles, which are bigger than the pores in the membrane are stopped, and particle, which are smaller, are let through. If two substances are separated by a semi-permeable membrane it water flows from the higher concentration side to the lower concentration side. Water will move until the concentration of water is equal on both sides, this is called osmosis. Osmosis gives rise to osmotic pressure and water pressure which effect osmosis. Water potential is the ability of water to move in this case through a semi-permeable membrane. Pure water has the highest water potential, 0, and has the greatest ability to move. Water potential = psi Cell = s + p S = solute potential P = pressure potential Fair test: There are many factors that I have to consider to enable this experiment to go as fairly as possible. ...read more.

Conclusion

water the potato increased in mass, and when the potato was put it a solution of low concentration of water, the potato lost mass and became plasmolysed. This backs up my scientific theory well and show that my prediction was correct. There is a point where there is a concentration of sucrose solution which wouldn't of made a difference to the mass and volume of the potato. Evaluation: Overall my experiment went well and I got good reliable results but I could of improved them by measuring a few factors more accurately. I could of measured the surface area of the potatoes more accurately and I could of made the weight of the potatoes closer to each other or measured the weight of each and recorded it, then worked out the percentage change with it's individual weight. Also while I was cutting and measuring some of the potatoes the others would start going brown which could of effected the results. After the potatoes were removed from the solution we had to dry them and some could have been dried more than others which could of effected the results. ...read more.

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