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By | Jan. 2013
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Haley Townsend
Alpert, Sweet, Townsend, Wrightson – Table 7
Mrs. Kneisel
Biology, Period 1
3 October 2012
Osmosis Lab
Introduction
The purpose of the osmosis lab was to explain how osmosis works. Osmosis is diffusion of water through a selectively permeable membrane. Hypertonic is when comparing two solutions, the solution with the greater concentration of solutes. Hypotonic is when comparing two solutions, the solution with the lesser concentration of solutes. Hypothesis: If the solution is hypertonic, then the potato slice will decrease because there is less concentration in the solution. If the solution is hypotonic, then the potato slice will increase because there is higher concentration in the solution. If the solution is isotonic, then the potato will stay the same because the solution would not change. If the solution is pure water, then the potato slice will remain the same mass because there is not a lot of concentration in water. Materials

* Goggles
* Rubber bands
* Balance beam
* Paper cups
* Salt solutions
* Pure water solutions
* Potato slices
* Plastic warp
* Weighing boat
* Sharpie Marker
Variables
* Independent variable: The type of concentration
* Dependent variable: Mass of the potatoes sizes
* Control variables: Mass of the potato, type of the potatoes, temperature of the water, amount of solution, change of concentration of the solution, and the time converted Observations
* Used my eyes to see how much it weighs
* Touching the potato to see how it feels. The potatoes felt hard and squishy. * Smelt the potato after it has been in the solutions. The potatoes smelt like vinegar.

Analysis Questions
Overnight the potato slices changed their mass and change the way they looked. This happens because as the free water molecules move while in osmosis they pass out through the permeable membrane. This is because there are a lot of free molecules on the outside...

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