Biology Osmosis Observation

Biology laboratory work Osmosis contemplation Measuring the dependence of net mass gain in tater pieces on concentration of borecole solution By Jonas Kulikauskas Siauliai Didzdvaris Gymnasium guess The more refined sugar in solution, the more potato mass volition decrease. Aim To see how potato mass entrust mixed bag at different concentration solution. Research question How the mass of potato allow change at different concentration solutions? Variables Dependent solution concentration.Independent sugar concentration in potatoes. Controlled time, potato form. Apparatus 1. 5 plastic cups 2. Distilated water 3. Potato 4. Knife 5. Clock 6. Electronical scales (0,05) 7. Bag of sugar 8. Measuring cylinder 9. Tap water Method Peeling great deal the potato and swell it into 1cm3 cubes (25 cubes) Weighing potatoes on the scales Putting different amount of sugar into pentad plastic cups (1st no sugar 2nd 6,8g 3rd 13,7g 4th 20,5 fifth 27,4g) Adding 100ml of water to each(prenomi nal) of the cups Mixing the sugar with waterPutting in 5 potatoes into each cup Waiting 20 minutes Pulling out the potatoes, drying them up and putting on the scales Writing down new mass. Amount of sugar in solutionSolution concentration %Cup numberMass of five cubes before(0,05g)Mass of five cubes after (0,05g) 0g0%15,8g6g 6,8g6,37%25,1g5,2g 13,7g12,05%35,5g5,3g 20,5g17. 01%45,6g5,4g 27,4g21,51%55,5g5,3g chart While the concentration is from 0% to 6,37% the net mass gets bigger, later on from 12,05% to 21,51% the net mass gets smaller.When the concentration is from 0% to 6,37% the net mass change is positive, when from 17. 01% to 21,51% negative. Conclusion The potato lost more mass as it was go under in bigger concentration solutions because the bigger concentration difference is, the osmosis will occurs more intensively. Evaluation I think that laboratory work went somewhat well, I managed to see the differences in potato mass change and harbour a conclusion of it. Next tim e I should write down original numbers and not rounded ones to give more consummate results.