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# Investigating the effect of osmosis on a potato.

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Introduction

Planning I am investigating the effect of osmosis on a potato. Osmosis is the diffusion of water down a concentration gradient through a semi permeable membrane. I am investigating the effect of water concentration on the potato chips. This means that I will put potato chips into salt solutions of different concentrations. There are also other factors involved, these are: - Temperature of water - Size of chip - Light - Mass of potato - Volume of solution potato is in - Type of potato - Time left in solution - Surface area of potato chip - Using the same balance to measure chip If I am going to make this a fair test, then I will have to control these other factors. Doing the tests at one fixed temperature will control the temperature of the water. For the purpose of my experiment I am going to do all the experiments at room temperature. The size of the potato is very important. This is because if the size of the potato varies, so will the amount of mass it can loose or gain. I am going to try to cut all the pieces of potatoes, to the same size. Because of the 'chipper� I will have chips with the same width and height, but the length of the chips will differ. I am going to cut the chips to 3cm in length. essaybank.co.uk The light intensity cannot really me measured or kept the same, as the chips will be moved from one room to another, for storage. ...read more.

Middle

I am predicting that the higher the concentration that the chip is exposed to, the more water will move out of the chip; making it flaccid. I am going to set up the experiment so I have three results per concentration, I will then take an average to make the test fairer. One result may not be accurate because of human error, so to get rid of the errors, I will repeat it. I will also do at least 3 types of concentrations, to have enough results and to see if my prediction is correct. I am probably going to do 4, these being; - Water - 3 x 2g salt - 3 x 3g salt - 3 x 4g salt The equipment I am going to use will be: This coursework from www.essaybank.co.uk (http://www.essaybank.co.uk/free_coursework/1547.html) Reproduction or retransmission in whole or in part expressly prohibited - A chipper - A white tile - A scalpel - 10 boiling tubes - A large beaker - A measuring cylinder - A large potato - Salt - Water - Weighing scales Preliminary Results My preliminary results were a bit rubbish, as I could not really think of anything to do except find out how many spatulas of salt or sugar went into 25ml of water. However these are my results: wwfa faw esfafas ayfa faba nfa kcfa fauk. Sugar into 50ml water = 15 spatulas Salt into 50ml water = 15 spatulas Although pointless I did decide that sugar took longer to dissolve into the water, so would I use salt instead (to save time). ...read more.

Conclusion

The range was big enough, but to fill in the gaps in my graph I could have taken different results, i.e. 1g, 1.2g, 1.4g etc. or even smaller. This way I could have found more accurate results. Also to make my experiment better I could have repeated it more, and possibly have worked with someone, as I was working on my own, or even with the whole class. I could have also cut the potatoes into doughnut shapes, because the cells in the middle of the potato might have different properties, making them react differently to osmosis. I could have also used a machine to cut the potato chips. I could also weigh each chip on a digital and more accurate scale, e.g. not to 0.00 but to 0.0000g. btrYahz9u from btrYahz9u essay btrYahz9u bank btrYahz9u co btrYahz9u uk There was one main anomalous result, this is highlighted in red and is two sizes bigger (tube I), but there is one more, but it is not that far out (tube B). This may have been caused by human error, or one out of my ten results might have been inaccurate, and changed the average. Or perhaps the chip was not cut accurately, or I added the wrong amount of salt. concentration. wwed edw esededs ayed edba ned kced eduk. I could extend my coursework by testing the same brand of chip using a different substance. By this I mean using a different thing instead of salt, i.e. sugar or coffee or even vimto. Then I could find out whether osmosis occurs differently with different things diluted in the water. I could even use different vegetables. ...read more.

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