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To investigate the effect of different solutions of varied concentration and discover if they increase or decrease the length of a cut potato chip when kept together in an uncontrolled environment.

Extracts from this document...

Introduction

Introduction Osmosis is the movement of water from a region of high concentration to a region of low concentration. Osmosis takes place when a solution is separated from another solution of a different concentration via a selectively permeable membrane. In this case water moves from a more dilute (low concentration) area to a more solute (high concentration) area. Water molecules pass across a membrane when they collide with it as shown in the diagram: When the membranes collide the water exerts a pressure on the membrane. This is called the water potential. Pure water has a water potential of zero so there are maximum collisions taking place which reduce the do not allow any water into the membrane. When solute is added to the water, the solute particles get in the way of the water reducing the number of collisions and making the water potential lower and therefore allowing water into the membrane. If the water potential is negative the water will move from an area of high water potential (high water concentration) to an area of low water potential (low water concentration). Main Experiment Aim: To investigate the effect of different solutions of varied concentration and discover if they increase or decrease the length of a cut potato chip when kept together in an uncontrolled environment. ...read more.

Middle

Amount of H20 (ml) Concentration of sugar solution (%) Length of potato chip before (mm) Length of potato chip after (mm) A 10 0 100 10 8 B 8 2 80 10 7 C 7 3 70 10 8 D 6 4 60 10 7 E 5 5 50 10 10 F 3 7 30 10 10 G 2 8 20 10 10 H 0 10 0 10 10.2 Results: Test one: 0Test Tube Amount of sucrose solution (ml) Amount of H20 (ml) Concentration of sugar solution (%) Length of potato chip before (mm) Length of potato chip after (mm) A 10 0 100 10 8 B 8 2 80 10 7 C 7 3 70 10 7 D 6 4 60 10 7 E 5 5 50 10 9 F 3 7 30 10 10 G 2 8 20 10 12 H 0 10 0 10 14 Test two: Test Three: Test Tube Amount of sucrose solution (ml) Amount of H20 (ml) Concentration of sugar solution (%) Length of potato chip before (mm) Length of potato chip after (mm) A 10 0 100 10 7 B 8 2 80 10 9 C 7 3 70 10 8 D 6 4 60 10 8 E 5 5 50 10 11 F 3 7 30 10 10 G 2 8 20 10 10.1 H 0 10 0 10 10.2 Test Tube Test 1 (mm) ...read more.

Conclusion

Preliminary potato experiment: Aim: To investigate the effect of various concentrations on potato cells. Prediction: I predict that the test tube full of distilled water will increase the chip and the two other test tubes full of sucrose solution will decrease the chip length. Apparatus: Half a potato 3 Test tubes Labels (a,b,c) Distilled water 0.5M sucrose solution 1M sucrose solution Method: Cut 3 potato chips the same size (1cm) Label 3 test tubes (a, b, c) Fill test tube A with distilled water, test tube B with 0.5M sucrose solution and test tube C with 1M sucrose solution. (All measurements of solutions and potato chip lengths are approximations only) Leave potato chip to soak in test tube for 30 mins, take out all three chips and record the length. Results: Test Tube Length of potato chip before experiment (mm) Length of potato chip after experiment (mm) Increase in size (mm) A - Distilled water. 40 44 4 B - 0.5m of sucrose solution 40 38 -2 C - 1m of sucrose solution. 40 35 -5 Conclusion: My results support my prediction. The potato placed in pure water increased and the potato placed in sucrose decreased. This is because the water is moving from where there is a lot of water (pure water in beaker) to where there is less water (potato chip). Sunny Gill 10B ...read more.

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