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We are doing a science investigation on finding out the concentration of the sap inside potato cells.

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Introduction We are doing a science investigation on finding out the concentration of the sap inside potato cells. Variables * The weight of the potato piece * The size of the potato piece * The concentration of the sugar solution after * The room temperature The variable that I am testing is the concentration of the potato piece, before and after the experiment. Pre-test I decided to do a pre-test so I could get an idea on what concentrations I could use for the investigation. I did one concentration, which was 0.75 molars. This concentration turned out to be far too high. When I did the pre-test I cut a piece of potato with a cork borer and then cut them into three slices each at 1cm long. We decided on three slices so we could have a more accurate result. I then weighed each piece and they all weighed 0.30grams. I recorded my results I accurately measured the concentration of the sugar solution, which was 0.75 molars. I got the concentration by putting 15mls of sugar solution and 5mls of water this made it so that there was 75% sugar solution in the beaker, which is 0.75 molars. ...read more.


� I then weighed all the pieces to make sure that they all weighed the same. Any pieces that weighed too much were carefully trimmed until they were the right weight (0.30grams). � The sugar solutions were all measured to be the same amount (20ml). � The five experiments were all conducted at the same time, for the same length of time. � This also ensured that the experiments were all carried out at the same temperature. Investigation I collected my equipment, which included: � A potato � A cork borer � A pair of scales � A scalpel � 1 molar sugar solution � A beaker � A 20ml-measuring cylinder � Water I then prepared my equipment by setting up the concentrations of the sugar solution with a 20ml-measuring cylinder. Firstly I got 10mls of sugar solution and 10mls of water for the 0.50molars. For the 0.40molars I needed 8mls of sugar solution and 12mls of water. For the 0.30molars I needed 6mls of sugar solution and 14mls of water. For the 0.20molars I needed 4mls of sugar solution and 16mls of water. For the 0.10molars I needed 2mls of sugar solution and 18mls of water. ...read more.


The results of my experiment are reliable because the line of best fit almost goes through all my results on my graph. The results all seem to give the right answer if you ignore the anomalous result. Strong sugar solutions draw the water out of the potato and weak solutions lose their water to it. To be on the safe side I think that the experiment should be repeated using more than the five sugar solutions that I used. The next experiment should also include sugar solutions outside and inside the scale that I used. This would include 0.0, 0.05, 0.15, 0.25, 0.35, 0.45, 0.55 and 0.6 molars as well as the strengths that I used in the first experiment. To get a greater accuracy in the next experiment, I think that more than three pieces of potato should be used in each beaker. I think that ten pieces of potato should be used in a larger beaker with a larger quantity of sugar solution. This should ensure that any anomalous results would not affect the average result to a great degree. To make my investigation more accurate I measured my solutions in a 20ml-measuring cylinder with my head level with it so I could get a clearer reading and I would get the right amount I wanted. ...read more.

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