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My aim for this experiment is to see the results of a potato tissue's mass difference, when placed in different concentrations of sugar solutions.

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Introduction

Homework Science Exploration Aim: My aim for this experiment is to see the results of a potato tissue's mass difference, when placed in different concentrations of sugar solutions. Osmosis is the passage of water molecules from a weaker solution into a stronger solution, through a partially permeable membrane. In this case, the tiny holes in the membrane of the potatoes will allow the water molecules to pass through in and out of the solution and the potato, depending on the concentration gradient of the two substances. So in this case, when the water concentration is lower in the tissue, the later will go inside the tissue of the potato, and the potato will gain mass. If there is very little different in the two water concentrations, there shouldn't be such a big change in mass. Also if there is a higher concentration of water in the potato, then the water will go out of the potato and into the liquid solution, as osmosis is the movement of water molecules from a region of high concentration to a region of low concentration, through a partially permeable membrane. ...read more.

Middle

The factors that I will control are the points in my fair test. Fair test: To make this experiment a fair test I will use the same... � Length potatoes- so that there is the same length of potato for osmosis to take place in. � Room temperature- so that this doesn't affect the rate of reaction. � Size cork borer- so that the size of the potato doesn't vary. � Amount of sugar water- so that the potato pieces have no more or less sugar solution to absorb. � Amount of time potatoes are left in sugar solution. - so that I can record accurate results. Safety: Safety is an important aspect in every experiment, even if the experiment seems to be very harmless. This is why I'll be taking this into consideration. I will be using a very sharp knife, which could injure someone if not handled properly. I will also be very careful that the solutions don't get into our bodies internally, because we are not fully aware of the damage it could do to us. ...read more.

Conclusion

It also shows that the potato cells increase mass in solutions with a high water concentration and decrease in mass in solutions with a low water concentration. I have been able to identify a pattern in my results, in the difference in weight. In this experiment, I believe that I have collected enough data to support my hypothesis. This investigation was, I think, successful. Successful meaning my results collaborated my predictions. The potato cells, working to stay alive, took in, or gave out the water depending on the concentration of the tissue and the concentration of the solution it is surrounded in. I have been able to record sufficient results by repeating the experiment three times. Evaluation I believe we gained accurate and sufficient enough results, shown on our graph and tables that concludes the experiment, and to prove our hypothesis. My results were very reliable, due to the precautions I took to make this a fair test. I can see by looking at my graph that there is a positive correlation for each set of results. ...read more.

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