Osmosis

Osmosis 

Introduction: 

Is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides. 
Water molecules travl through the plasma membrane in order to equilibrate the intra and extra cellular concentrations.

Material:
- Potato
- Spatula
- Salt
- Distilled water
- Acetic acid
- Knife
- 600 mL Beaker
- Pen

Objectives: 

1. Know about the osmosis phenomena.
2. Understand the process of osmosis in plasmatic membranes.

Procedure: Potato
- Cut the potato in three pieces and put one piece in a watch glass, the other pieces in another watch glass,...
- We take the spatula and make a hole in the middle of the potato.In this hole we put salt and another hole, distilled water. 

Observations: 
In the first potato (control of the experiment) is the normal potato.
In the second pass (salt treatment) the potato has more water than the beginning.
In the third pass (distilled water) the potato absorbs all the water and now it's hard and dry.