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Investigation into Osmosis.

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Investigation into Osmosis Aim To find the concentration of salt solution that is the same as the concentration of dissolved substances in potato tissue. At this point osmosis will not occur Prediction From my preliminary work I can determine that the concentration will be between 0 and 1.0m (Molars). In the preliminary work the potatoes gained 7% mass at 0m and lost 16.1% at 1.0m Apparatus Film Canisters Salt Solutions of Concentrations 0m, 0.25m, 0.5M, .075m and 1m 200cm� measuring cylinder Potato Cork Borer Ruler Scalpel Balance Method 1. Use the measuring cylinder to measure 20cm� of each solution into film canisters. Label the canisters 2. Use the cork borer to make potato cylinders and cut them into 2 pieces each 2cm in length 3. Record the start measurement in the table of results 4. Put 2 potato pieces into each film canister 5. Leave for 10 minutes 6. Take each potato piece out of the solution and shake it 3 times to remove excess liquid 7. Re-measure each potato piece and record the results in the table 8. ...read more.


-0.02 -1.48 1.50 1.50 1 1.20 1.17 1.35 1.325 -0.025 -1.85 1.50 1.48 Analysis From the experiment I have found out that when you increase the molar concentration of the salt solution the potato cylinders loose mass. My graph of results shows that the potato cylinders gain weight with concentrations of 0m, 0.25m, 0.5m and loose weight with concentrations of 0.75m and 1m. Osmosis goes from a dilute to a concentrated solution so between 0.5 and .075 is where the potato will neither gain nor loose weight. This would probably be at 0.65 molars. The potato in a solution of lower concentration gained weight because the concentration of the potato is higher than the concentration of the salt solution and when the potato lost mass the concentration of the potato was lower than the concentration of the salt solution. From what we know about osmosis it is where water goes from a high concentration to where water is in low concentration, so when the molar concentration was high the water from the solution went into the potato making it gain weight and vice versa. ...read more.


The error could even be because of error in taking results, although I find that unlikely because the weight was checked twice for each potato to make sure the readings were accurate. In my experiment I found out that it was hard to take the results as they had to be taken individually all at the same time and therefore some of the cylinders were still going through osmosis. The experiment should have been set up with delays between each canister giving me time to get the results of each cylinder accurately, but unfortunately there was not enough time to do this. But overall I think the reliability of my results based on my method was very good given the equipment that was used in the experiment. Looking back on the experiment there are a few things that could be changed given more to improve the reliability and the accuracy of the results taken * Using different types of sugar solution * Use different concentrations around the 0.65m area for example 0.6 to 0.7 in increments of 0.05 to find out the exact point where osmosis does not take place and prove more accurate results Matthew Briggs Page 1 ...read more.

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