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Biology Investigation - Osmosis

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Introduction

Adam Culling Biology Investigation-Osmosis Planning I am investigating the effects of various amounts of salt and sugar on the osmosis abilities of a potato chip of volume 2cm.x1cm.x1cm. in a 25ml. Solution. To make the test fair I will have to keep the amounts consistent make sure they are measured as accurately as possible. Prediction I think that salt and sugar will both have a negative effect on the osmosis ability of the potato chip because, when osmosis occurs the water will always diffuse from the most concentrated solution (in this case, the potato) to the more concentrated solution (the salt/sugar solution outside the potato) ...read more.

Middle

I am going to take four readings for both salt and sugar, ranging from one to four spatulas of each substance. I am also going to take a reading with pure deionized water as a control. The key features that need to be kept the same are the amount of water (25ml.) and the size of the potato chip (2cm.x1cm.x1cm.). I must also always use deionized water. No preliminary experiments or secondary sources were necessary in the planning of this investigation. Observing Solution Mass before (g.) Mass after (g.) Pure deionized water 3.24 3.40 1 spatula salt 3.26 3.14 2 spatulas salt 3.16 2.99 3 spatulas salt 3.06 2.78 4 spatulas salt 2.98 2.78 1 spatula sugar ...read more.

Conclusion

This helps the potato maintain a high concentration of salt and sugar. Evaluating I had an error in my investigation when in one of the readings for sugar the mass of the potato went up instead of down. I retook the result and it came out as expected the second time. My results support my conclusion that salt and sugar would both have a negative effect on the osmosis ability of a potato. I could have improved the experiment by taking multiple readings for each amount of salt and sugar. If I were going to extend my experiment I would carry on taking results until the effect of salt and sugar on osmosis reached saturation point. ...read more.

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