Boiling Tube Of 1 Molar Salt Solution example essay topic
386 words
Biology Coursework Problem A cook wishes to prepare chips for a meal the following day. How does the cook keep the chips so that they will stay fresh. Experiment 1 Background Potatoes have selectively permeable membranes (cell membranes) that lets water move from cell to cell by osmosis Plan I am investigating what you should keep chips in to keep them fresh. I will try to keep the chips the same weight and I will put them in the same amount of liquid solution. Hypothesis I think the chips should be kept in pure water because if kept in salty water all the water would leave the potato so it would just be salt in it so it would rot. Apparatus Potato, corer, balance, scalpel, boiling tubes, water, salt solution, tile.
Method 6 chips of potato were cut about the same size and weight, 3 were put in to boiling tubes full of water and 3 were put into a boiling tube of 1 molar salt solution. They were left for a few days. Results: liquid Beginning weight End weight % change Salt solution 5.6 g 6.01 g +43% water 5.6 g 5.4 g -28% Experiment 2 Hypothesis Because of experiment 1's results, we decided to try solutions between water and 1 molar salt solution. We decided to have 3 test tubes of 2.5 ml water to 7.5 ml 1 molar salt solution and 3 test tubes of 7.5 ml water to 7.5 ml 1 molar salt solution Method We did the same as in experiment 1 but put the potato in the solutions talked about in the hypothesis. The experiment was not a complete success as it gave us enough information to guess the perfect solution but the conditions might not have been perfect. That is probably why the results are not the best and the fact that we used different weights of potato.
Evaluation The test would have been fairer had we used the same size potato for each salt solution. The differences in density of the potatoes were also difficult to measure accurately. The experiment should be repeated again using different concentrations of salt solution before accurate results could be obtained David San dham 10 F 26.01. 2003.
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