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EXPERIMENT TO INVESTIGATE THE CONCENTRATION OF THREE SOLTIONS USING OSMOSIS

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Introduction

EXPERIMENT TO INVESTIGATE THE CONCENTRATION OF THREE SOLTIONS USING OSMOSIS Aim The aim of this experiment was to determine the concentration of three solutions using the theory of osmosis. Apparatus and chemicals: Apparatus needed: * Cork borer * Scalpel * White tile * 3 Petri dishes * Ruler * Potato * White A4 paper * 3 solutions labelled A, B and C 1 of which is water 1 of which is concentrated sugar solution 1 of which is a dilute sugar solution Method 1. A piece of A4 paper was marked with the letters A, B and C. 2. One half of a Petri dish was placed on each of the labels making sure that the Petri dishes were all the same size. ...read more.

Middle

6. The solutions labelled A, B and C was poured into the corresponding Petri dishes making sure that there was an equal amount in each. 7. The experiment was left for a specified time and then the potato was dried and measured again and the results noted. Diagram Results The results were as follows: Solution Original length of potato cm's Final length of potato cm's Increase/ Decrease in length cm's Average Increase/ Decrease in length cm's % Increase/ Decrease A 6.5 6.5 6.5 6.2 6.2 5.9 -0.3 -0.3 -0.6 0.3+0.3+0.6/3= -0.4 0.4/6.5*100= 6.7% Decrease B 6.5 6.5 6.5 6.4 6.4 6.4 -0.1 -0.1 -0.1 0.1+0.1+0.1/3= -0.1 0.1/6.5*100= 1.5% Decrease C 6.5 6.5 6.5 6.7 6.7 6.7 +0.2 +0.2 +0.2 0.2+0.2+0.2/3= 0.2 0.2/6.5*100= 3.1% Increase Conclusion Solution A: The potato cylinders in solution A. ...read more.

Conclusion

Solution B: The potato in solution B only changed by 1.5%. This shows that the same amount of water had left and entered the cells of the potato. This shows that the concentration of sugar in the water was the same as the concentration in the potato. This means the solution in the Petri dish was a dilute solution. Solution C: The potato in solution C increased in size by an average of 3.1%. This shows that the potato took water until it could not take in any more and became turgid meaning that it was rigid and hard. This means that the concentration of water in solution C was higher than the concentration of water in the potato. Experiment 5 21 October 2008 Ashley Spirit 1 Awareness of Science ...read more.

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