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Investigate how the concentration of sugar solution affects the length of the potato.

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Introduction

Coursework on osmosis Aim: To investigate how the concentration on sugar affects the length of the potato. Scientific Knowledge Osmosis is the movement from a higher concentration of water molecules to a lower concentration of water molecules. It is a special kind of diffusion, which only occurs when there is a partially permeable membrane; this partially permeable membrane only allows substances like water to move through it. An example of this would be like this As you can see in the diagram above the water molecules move down the concentration gradient from high to low concentration until a new equilibrium is established. This is because there are more water molecules in the dilute sugar solution then in the concentrated sugar solution; therefore the dilute sugar solution has a higher concentration of water molecules. Thus water molecules will travel from the higher concentration of water to the lower concentration of water, which is the more concentrated sugar solution. ...read more.

Middle

This is how to formulate a fair test. Now after placing the sugar in the test tubes you will mix it with a stirring rod. Now place 3 potato tubes into each test tube so after when you look and observe your answer you can have three answers not only one making it fairer and if anything went wrong with one of the potato tubes you would know. Also we made each potato tube 4 cm long so that we would be able to see how big or short the potato would become. Now leave the test tubes for about 3 days then observe the results that occur. Results Amount of sugar Start End Grew 10g 40mm 40mm 0mm 20g 40mm 39mm -1mm 30g 40mm 38mm -2mm 40g 40mm 37mm -3mm Pure water 40mm 41mm 1mm Analysis and conclusion The whole point of doing the experiment was to find out how the concentration of sugar in osmosis can affect the size of the potato tube. ...read more.

Conclusion

This diagram explains why the potato will become turgid or flaccid. In conclusion I believe that the amount of sugar you place inside the water does affect how the potato tube will grow or shorten because of the way osmosis works with the potato cell and its cell membrane (partially permeable membrane). Also the amounts of water that you place there will affect the way it shortens or grows as well. Evaluation I think that we could of made the experiment fairer by actually timing how long we actually placed the potato tube in the test tube for. Also I believe we could of weighed our test tubes to see if any contents fell out so we could start again. And lastly I believe that if we not only measured the size of the potato tube but weighed it at the start of the experiment and at the end we would have had more results to work on giving us a more accurate answer. ...read more.

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