Osmosis In A Potato :: Papers

Osmosis In A Potato Intro: ====== My biology coursework is based round the osmosis process that takes place in potatoes. Osmosis is the intake of a salt solution through a selectively permeable membrane. The strength of a salt solution can have a dramatic difference on the amount the potato can take in, and how it reacts. Here is an example of a selectively permeable membraneà ¢Ã¢â€š ¬Ã‚ ¦ Salt Solution [IMAGE][IMAGE] Strong Weak [IMAGE] Strong Weak Salt Solution [IMAGE] Variables: An fundamental necessity in my biology experiment is to decide which variable I am going to use and modify. A variable is an aspect of the experiment which can be modified in order to change the outcome of the entire osmosis experiment. Below are the variables I have available * Temperature * Solution Strength * Size Of Potato * Weight Of Potato After a lot of careful deliberation I have decided to use the solution strength as my variable. I chose this because it enables me to witness the effect different strengths of solution have on osmosis. Method: To carry out my experiment successfully I will need to stick to the diagram belowà ¢Ã¢â€š ¬Ã‚ ¦. [IMAGE] Firstly, I will take 6 test tubes with different strength salt solutions and add them to a test tube rack. I will then cut up a potato and measure them to make sure they are the required size, for this experiment I have chosen 1.0cm. I will then add two measurements of potato into each test tube. The test tube will then be left over night in a fuming cupboard, and results will be taken the next morning. Fair Test: To make sure my experiment is fair I will stand by the following guidelinesà ¢Ã¢â€š ¬Ã‚ ¦ * Use the same sized test tube. * Make sure each strength is measured exactly. * Make sure each piece of potato is exactly the same size as the next.