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osmosis. Aim To find out how much salt should be added to water to keep potato chips as they were when first chipped.

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Introduction

Osmosis in Potatoes Aim To find out how much salt should be added to water to keep potato chips as they were when first chipped. Introduction & Theory Cells are surrounded by a cell membrane which has tiny holes in it. This is said to be partially permeable as it allows small molecules to pass through. Osmosis is the movement of water molecules from an area of high concentration (weak solution) to an area of low water concentration (strong solution) through a partially permeable membrane. Water actually moves both ways to try and even up the concentrations. If there is more movement one way we say there is a net movement of water into the area where there is less water. ...read more.

Middle

a hypertonic solution, they take in water by osmosis until they burst. (add something about blood cells and see fig 3) Figure 3 The concentration of the solution that surrounds a cell will affect the state of the cell, due to osmosis. There are three possible concentrations of solution to consider: * Isotonic solution a solution of equal concentration to a cell * Hypertonic solution a solution of higher concentration than a cell * Hypotonic solution a solution of lower or concentration than a cell The effects of these solutions on cells are shown in this diagram below. (Figure 4) Figure 4 Hypothesis ( need 3 short sentences) ...read more.

Conclusion

* Carefully dry the potato chips with a paper towel. * Measure and weigh each potato chip. * Place the potato chips in labelled test tubes with various salt solutions. * Time the submerged potato chips for exactly one hour. * Drain the potatoes and dry off with a paper towel. * Again measure and weigh each potato chip. * Record results on a table below. Results Test tube Salt (g) Original mass of potato before (g) (a) Mass of potato after (g) (b) Change in mass (g) (b) - (a) = (c) % change in mass (c) / (a) x 100 A 0.0 1.48 B 0.5 1.52 C 1.0 1.59 D 1.5 1.45 E 2.0 1.63 F 2.5 1.56 G 3.0 1.61 H 3.5 1.64 I 4.0 1.45 ...read more.

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