A Complete Resource Guide on Osmosis
Added on 2021-04-24
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INTRODUCTIONBy definition, osmosis is the net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration (hypertonic solution) from a region of lower solute concentration (hypotonic solution) (Lion and Allen, 2014). Molecules tend to move in the direction that tends to equalize the solute concentrations between the more concentrated side and the less concentrated one(Phuntsho et al., 2012). Therefore the experiment is based on the mass of the potato strip before and after the experiment thus a mass change if osmosis occurs.AIMS AND HYPOTHESISIn this experiment, the factors of osmosis under investigation are concentration of solutions and temperature. To investigate osmosis in a potato strip, the strips would be placed in different concentrations of NaCl, in normal water and in hot water. The expected results are that there would be mass changes between the initial potato strips and the final strips after osmosis has taken place. As the concentration of NaCl increases or water temperature increases, the final mass of the strips will decrease since the strips become dehydrated. METHODSFirst, I prepared 10 solutions from distilled water and different concentrations of NaCl ranging from 0g-6g. Of these 10 solutions, I prepared 5 solutions each with a different NaCl concentration at a temperature of 21c ̊ and the other 5 solutions, each with a different NaCl concentration, I used hot water at temperature 42c ̊. Next, I prepared 20 peeled potato strips and weighed each of the strips and recorded their respective masses. After that, I put 2 strips of potatoes in each solution and I left them to stay still for 20 minutes. After 20 minutes I weighed all strips of potatoes and recorded their respective masses.
No. of tubeConc. of NaCl (g)Distilled water (ml)Type of water10100Normal21.5100Normal33100Normal44.5100Normal56100Normal60100Hot71.5100Hot83100Hot94.5100Hot106100HotRESULTSAfter taking the weight of the potato strips in each of the tubes, I recorded their masses in the table below where mass before the experiment is labeled initial weight of the potato. I placed the potato strips in their respective tubes with each solution having a temperature of 21c ̊. After 20 minutes, I weighed the weights of the respective potato strips in each of the tubes and recorded their masses in the table below on the column labeled final weight of the potato. To investigate the rate of osmosis, I calculated the percentage mass change which is the percentage ratio of mass change with initial weight.Table of normal water at 21c ̊ No. of tubeConc. of NaCl (g)Initial Weight of potato (g)Final Weight of potato (g)Percentage mass change %107.137.616.7321.57.207.240.56
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