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An Investigation Into Factors Affecting The Rate Of Osmosis

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Introduction

An Investigation Into Factors Affecting The Rate Of Osmosis Plan Aim To find out if osmosis occurs in a potato, and to observe how different concentrations of a solution affect the rate of osmosis in the potato. What Is Osmosis? Before actually planning the experiment, I will do some research to find out about osmosis, and matters related to it, so that I can make predictions and work out a way to make this investigation fair and safe. Planning ahead would assist me in finding out how to do what, when to do it etc. This should lead me to good results at the end of the experiment. Osmosis is the movement of water molecules from a solution of high water concentration to an area of low water concentration, through a semi permeable membrane. Below is a diagram illustrating the process of osmosis: Water potential is the tendency of water to move from an area of higher concentration to one of lower concentration. This is a main factor that affects the rate of osmosis, as the higher the concentration of the water, the more likely it is to move to an area of low water concentration. ...read more.

Middle

* Different Molar Solutions (o-1m at 0.2m intervals) - To test the rate of osmosis. * Potatoes - To test the rate of osmosis * Tissue paper - To dry the potatoes/scales after the osmosis takes place. * Weighing scales - To weigh the potatoes at regular intervals * Cork borer - To cut out potato cylinders First we will cut out 5 pieces of potatoes from the same potato using a borer so that we have all the potato strips at the same length and same mass. We are using potatoes because it is a cheap and efficient way of conducting the investigation as they have large amounts of homogenous tissue and this is perfect for osmosis. The cell surface membrane of potato cells acts as the semi-permeable membrane for osmosis to take place. Then we will cut the potato with more accuracy using a magnifying glass and a ruler making sure that all the potatoes are as equal as possible in length. There will be 5 test tubes, 3 pieces of potato in each test tube. After we have cut all of the potato pieces, we will weigh them individually. ...read more.

Conclusion

Carrying out the experiment in a constant temperature for the duration of the experiment is important. And to avoid temperature change, which might affect the different sets of results, we will take the temperature of the room/solution into account. Getting and experimenting with the exact measurements of molars and water is vital to this task. If the volume of one solution in a test tube is higher or lower than another, it will affect the pattern of results later on. Small things such as a unclean petri dish, and a slightly cracked measuring cylinder could still affect the results, and therefore we will take these into account as well. Safety Safety is an important aspect in every experiment, even if the experiment seems to be very harmless, and that is why we take this into consideration, no matter what. We will be using a very sharp knife, which could injure someone if it is not handled properly. And we will also be careful that the solutions don't get into our bodies internally, just in case, because we are not fully aware of the damage it could do to us. But other than that, there weren't any other matters to be cautious of. ?? ?? ?? ?? Sheroy Zaq 11Q GCSE Biology Coursework ...read more.

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