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So was the dye inside the egg or only on the membrane? Did you guess correctly? Check out the broken egg on the floor. When the egg went splat, notice that its insides were red. This is because the red water in the cup diffused inside the egg through the cell membrane. Now check out the eggs in the cup. Last night we soaked the eggs in clear salt water, so why is the water colored again? This is because the colored water inside the egg diffused out through the membrane and into the cup of salt water. The process of water moving from an area of higher concentration to an area of lower concentration is known as osmosis.

Tonight we are soaking our eggs in a solution of the students' choice. We have a great variety of liquids, examples include WD-40, Pepto, laundry detergent, tea, chocolate sauce, Listerine, and pancake syrup.

Posted by Ms. Larkin