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Osmosis Essay

787 words - 3 pages

IntroductionOsmosis is the movement of water from a less concentrated solution to a more concentrated solution through a partially permeable membrane.Osmosis is affected by:Water potential - This is the tendency of water to move from an area of higher concentration to lower concentration.Temperature- Cells move faster at a high temperature therefore if there is a high temperature there is a higher rate of osmosis.Pressure- Areas of different pressure have different water potentials.Surface area- the larger the surface area, the more water can be absorbed into the cells, therefore altering the rate of osmosis.In this experiment we wanted to show how the concentration of salt affects the rate of osmosis.HypothesisAs the concentration of salt solution is increased, the rate of osmosis increases.AimMy aim was to find out if the rate of osmosis increases with concentration of salt solution.Independent variableThe concentration of salt solution placed in the dialysis tubes. It is the independent variable because in every tube different amount of salt was put to make a difference.Dependent variableThe weight of the dialysis tubes was the dependent variable. This was the variable that changed as a result of the concentration of the solution.Control variableThe control variable is the amount of water that is used. This is because the same amount is used during the whole experiment and this is used to examine the rate of osmosis.The other control variable was the time as it was constant in all concentrations.ApparatusA weighing scale6 dialysis tubes3 beakers1 stopwatch1 measuring cylinder1 syringe10 grams of salt20 grams of saltDistilled waterA ball of stringMethodWe took a 20 cm dialysis tubing and soaked it in water to open the ends.We tied a knot with string tightly at one end.We were careful not put any solution in the first tube. In the second tube we put 5 grams of salt solution in the tube and in the third tube, we put 10 grams of salt solution using a plastic syringe.We tied a knot at the end of the tube and put it in a beaker with 200 ml of distilled water.We weighed each tube before the experiment and after every 10 minutes.To make the results comparable and remove bias, we did two trials.We observed the results and presented them in a table.ResultsTable of data
Trial

Weight of tube with
no solution

Weight of tube
with 5 grams of
solution

Weight of tube
with 10 grams of
solution

1

10 min

1.80 grams

7 grams

15 grams

20 min

1.80 grams

8 grams

16 grams

30 min

1.80 grams

8.5 grams

18 grams

2

10 min

0.80 grams

5 grams

14 grams

20 min

0.80 grams

6.5 grams

15.5 grams

30min

0.80 grams

7 grams

17...

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