Essay on How Osmosis Affects A Potato Chip

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How Osmosis Affects A Potato

Aim: - To See How Osmosis Affects A Potato

Preliminary work

Prediction: -I predict that the weight of the potato in the sugar solution will decrease and the weight of water will increase. I predict that the weight of the potato in the sugar solution will decrease when it reaches 3:1 (salt: water).

In put Variables:

-Size of potato
-Mass of Water
-Molarity of Sugar
-Length of time in the solution
-Temperature of water

Out put variables:

-Weight of potato

Key variables:

-Molarity of sugar. This is a key variable because it has the most effective outcome because osmosis only works when there are different molarities in and outside of the potato other wise the
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In this case, the tiny holes in the membrane of the potatoes will allow the water molecules to pass through in and out of the solution and the potato, depending on the concentration gradient of the two substances. So in this case, when the water concentration is lower, the water will go inside the potato, and the potato will gain mass. If there is very little different in the two water concentrations, there shouldn't be such a big change in mass.
Also if there is a higher concentration of water in the potato, then the water will go out of the potato and into the liquid solution, as osmosis is the movement of water molecules from a region of high concentration to a region of low concentration, through a partially permeable membrane.

Preliminary Plan

1. Two test tubes and put them in a test tube rack

2. Fill both test tubes with the same amount of water about 1/3 of the way full.

3. In one of the test tubes add sugar and mix it in with the water

4. Label this test tube sugar

5. Using a borer get two pieces of potato and cut the ends off.

6. Make sure that they are both the same size and weigh them

7. With a stop clock time 5 minutes for both of the potatoes bits when they have been dropped in the water so they both have the same amount of time.

8. After they have been in for 5minutes take them out with a pair of tweezers and get rid of any excess water with a tissue
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