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How Osmosis Affects A Potato Chip

1377 words - 6 pages

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:

-Molarity
-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 diffusion
theory of osmosis wont work.

We are going to keep a fair test by:

- Keeping all the volume of water the same in each test tube

- Keeping the starting weight of the potato the same to begin with

- When removing the excess water of the potato make sure all excess
water is removed but without squeezing any water out of the potato

- Keeping the temperature of the water the same

- Use the same type of potato (grown from the same potato)

We will keep the experiment safe by making sure that all the test tube
racks are in a suitable position so they wont easterly be knocked
over.

Preliminary results
---------------------------------------------
Sugar Water Time left in

0.44g 0.44 Start
0.43g 0.44 5mins
0.42g 0.45 10mins
0.49g 0.46 15mins
0.38g 0.46 20mins
---------------------------------------------

The table above shows the weight of the potato.

Prediction

I predict that the weight of the potato in the sugar solution will go
down and the weight of the water will decrease because the water
molecules in the sugar solution are small enough to diffuse through a
semi-permeable membrane in the potato is the high concentration of
water and water will only go through from a high concentration to a
low concentration of water. Water goes into a potato sample because
there is a higher concentration of water out side the potato than
inside of the potato and water will go from a high concentration to a
low concentration therefore the water will go into the potato and it
will weigh more. Osmosis is the passage of water molecules from a
weaker solution into a stronger solution, through a partially
permeable membrane. 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...

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