Investigating the Factors that Affect Water Uptake by Potatoes

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Investigating the Factors that Affect Water Uptake by Potatoes

Plan

Osmosis is the movement of water from a region of a high concentration

to a low concentration of water through a selectively permeable

membrane.

Aim

To find the concentration of the solution in the vacuole of the

potato.

Prediction

I predict that when the potato chip is placed into the water solution,

its mass will increase because that water moves from a high

concentration to a low concentration. When the potato chip is placed

in 100% salt solution, I predict its mass will decrease.

Variables

* Concentration of the salt

* Size of the potato chip

* Time of incubation

* Variety of potato

* Skin on potato chip

* Temperature

* Volume of water

Scientific Explanation

I think that when the potato chip is placed in water its mass will

increase because water moves from a high concentration to a low

concentration. This process is called osmosis which is the movement of

water from a high concentration to a low concentration through a

selectively permeable membrane.

The water is stored in the vacuole in the cell of the potato chip and

as that expands then so does the mass of the potato chip.

Method

The following apparatus were used:

* Scales

* Potato chip

* Water solution

* Measuring jugs + beakers

* Thermometer

* Boiling tubes

* Stop clock

* Knife

* Pipette

Salt Concentration (m)

Volume of water (cubed cm)

Volume of salt solution (cubed cm)

0

30

0

0.2

27

3

0.4

24

6

0.6

21

9

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