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Abstract

This science project was done to find out if water will move through a semi permeable membrane to a solution of higher concentration. The science project experiment was carried out using several eggs immersed in distilled water and salt water.

Hypothesis

Water will pass through the shell of an egg, to the side that has a solution of higher concentration.

Scientific Terms

Osmosis, hypotonic, hypertonic, semi permeable membrane, molecules

Background

Osmosis

Osmosis is the process by which water travels through a semi permeable membrane from a solution having a low concentration to a solution having a higher concentration. The solution with a low concentration is referred to as a “hypotonic” solution, and the one with a higher concentration is called “hypertonic”. The purpose of this process is to equalize the concentration of the solute on both sides of the membrane.

The process of osmosis is very important for living organisms. Cells use this process to pull in and expel water from within the cell walls. The walls of the cells act as the semi-permeable membrane. The membrane allows smaller molecules like water to pass through but prevents larger organic molecules from leaving the cell.

Plants use this process to absorb water from the surrounding soil into their roots. Their roots normally branch out in search of water and to increase the surface area for absorbing water.

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Complexity level:
9
Project cost ($):
10
Time required:
1 hour to prepare, 2 days for the science fair project
Material availability:
Easily found
Safety concerns:

Basic safety requirements