Osmosis Lab Report

Hypothesis:

The concentration of a solute does affect the rate of osmosis over time, the higher the concentration of a solute, the faster the rate of osmosis. This happens because, in a semi-permeable membrane the water is the only through that can move through. In this case our solute is sugar, and sugar cannot fit through the pores in the membrane. When there is more sugar the difference in concentration is greater. That difference makes all the molecules want to go. That results in osmotic pressure being built up. Everything moves, the sugar tries to get through, but the pores don’t accommodate it. It being neat the pores block the water going through. That means that the water can only go through less pores because more sugar is blocking

We take a long strand of dialysis tubing, and split it into nine 3 inch pieces.

2. Fill a flask with pure water (0% sugar), one with 0.2M water, another with 0.4 M water, and the last one with 0.8M water.

3. Also fill a smaller flask with pure water as well.

4. Take a piece of dialysis, find the mass of the dialysis, and the zero out the scale on which the dialysis was measured.

5. Then take the tubing, and dip it into the water to open it up, do it on both sides.

6. Next tie one side tight, and fill the tubing with water, and once it is filled to the top, close the top and tie it as well.

7. Then measure the mass of sphere, the drop it in the 0.2 solution for 7 minutes.

8. After time is up take the mass of it again.

9. Then record the changed mass.

10. Repeat 3 times for both 0.2M and 0.8M.

11. Then make the same ball for the 0.4 solution except put tape around

After extensive review, we realized that this was not the case. We had conducted three different tests. In one test we had dropped our dialysis tube into a flask where the concentration was 0.8M and in that trial, we got an average of 0.1566g of water lost(three trials) . With the trials of 0.2M, the info shows that 0.27g of water were lost on average. The last part of the experiment we conducted a trial with the tubing in 0.4 water, but the catch was that we had surrounded the tubing with tape. That tape was to simulate the 0.8M solution because we felt that with the 0.8M solution, there was more sugar that blocked pores on the semi-permeable membrane. We believed that since the sugar block some of the pores, it would be like covering part of the faucet spout and it would make the water move through at a stronger and faster rate. After the trials, our prediction was correct in a sense; the tape did affect the osmosis. The tape had affected the osmosis, but it had had less mass lost than we expected. We conducted this trial before we had done the 0.8M solution, so this was against our beliefs at that stage. The data showed that the tape had made the dialysis tube lose 0.1866g on average. Our initial hypothesis stated that in the higher concentration, the sugar would be in an abundance and it would cover up the pores. We had thought that the pressure built up by that was