Osmosis Investigation

2. Make sure that the 4 beakers had the same volume.

3. Cut the potato in 4 pieces.

4. Measure the mass of pieces potatoes, make them the same weight then put them in the 4 beakers.

5. Look at them carefully in next minutes, from the observation write down the results.

6. Measure the mass of these pieces of potatoes again and compare with the mass measured before.

7. Wrote down the data and considerate.

VARIABLES:

Independent: The water that we changed throughout the course of our experiment was different concentrated water. This could be problematic, as it was hard to ensure that each of the beakers was the same size. Also, as the potato, I tried to make it accurately. However, this could present an unfair effect.

Dependant: By changing the different concentrated water as mentioned in the independent variables, we weighed the potato pieces at beginning to make sure that all the potato pieces have the same weight. In addition, we needed to keep the time the same of each beakers so that to make it a fair experiment.

Fair testing: 1.Keep the same mass of the potato pieces.

2. Keep the same volume of water.

3. Keep the same size of the beakers.

4. Keep the same time.

Results:

The following is the table to which I have recorded the results from our experiment in:

Concentrated

Weight before (g)

Offer (g)

Difference (g)

0

.10

0.10

0.2

0.98

.04

0.06

0,4

.01

.04

0.03

0.6

.01

-0.01

0.8

.01

0.98

-0.03

.0

.01

0.98

-0.03

The table shows different concentrated water affect potato, according to the table above, the number of offer is decreasing as well as the difference. However, the more the water is concentrated the less weight the potato got. The first three data shows that the potato becomes larger and heavier, on the other hand, the last three data was opposite.

CONSLUSION:

From this experiment, the data shows if the water has low concentrated with sugar then the weight of the potato increases the most. Actually, when the concentrated is 0.5 the potato probably will stay the same, because it is the balance to keep the water in the middle point. Basically, diffusion is the movement of a substance from a region of higher concentration to a region of lower concentration and osmosis can occur through a cell membrane in both plants and animals to make the potato becomes heavier and larger.

EVALUATION:

It was a shame that I did not do the experiment with my partner, because that day I was away. However, we made the plan together so she did it, the results was quite good because it showed some important information to us, although there were some numbers not accurately we expected, they also brought some ideas to write my investigation. The things which we can improve is to make the potato the same weight at first so that the results can be more reliable, also, we can use more data to persuade the conclusion we made.

Delia Wu