Osmosis lab

1661 Words Jan 17th, 2015 7 Pages
The Measurement of the Rate of Osmosis by using “Deshelled” Chicken Eggs
(Effect of Solute Concentration upon Rate/Degree of Osmosis in Chicken Eggs)
Introduction
Every cell needs a mechanism that it uses in the maintenance of a constant internal environment. This is important in the control of the ever changing external environment to the cell. The transfer of materials to and from the cell thus needs a very stable mechanism to achieve this status. Cells are therefore bound a membrane that acts the selective controller of the movement of different substances to and from the cell. This is especially when dealing with the solutes both to and from the cell. Some solutes must be allowed to move into and out of the cell depending on the
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Materials and Methods
Part I: Effect of the Solute Concentration Each group of students were given 2 chicken eggs from which the shell had been dissolved away. The remaining membrane that was the shell membrane was considered to be differentially permeable. Each egg was assumed to have approximately the same concentration of solute in the membrane. Based on the rate of osmosis, the experiment attempted to determine what the concentration must have been. Each egg was then weighed separately to the nearest 0.1g and results recorded the weights in a Table at time “0.”Each egg was again placed into separate beakers containing solutions of either distilled water (0%), 10% sucrose, 20% sucrose, 30% sucrose, 40% sucrose and an unknown sucrose solution. At 15 minute intervals that is after 15, 30, 45, 60, and 75 minutes, the eggs were removed from the beakers. They were then carefully wiped off all excess water; and again each egg weighed separately. Record the weights or masses were then recorded and weight changes placed in the Tables. Plot the changes in weight of each of the eggs were then plotted against time in a graph as shown in the results section. Several questions were then answered based on the results obtained.
Which solutions would you say were hypotonic to that of the eggs?
Which of them were hypertonic? Isotonic if there were any?
What would you expect to happen if an egg was put

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