Membrane Function practical

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Membrane Function

Planning A

[Problem]

Demonstrate the process of osmosis through a semi-permeable membrane.

[Aim]

To use a chicken egg as a model to demonstrate the process of osmosis

[Hypothesis]

The rate of osmosis increases, the concentration of the solution decrease.

As we know the Osmosis is the passive movement of water molecules, across a partially permeable membrane, from a region of lower solute concentration to a region of higher solute concentration. So if the solute concentration idecreases, the rate of osmosis increases.

Planning B

[Variables]

  Independent variable

The concentration of the solution (the egg goes in)

  Dependant variable

The weight of the egg

Controlled variable

.the same electronic balance

.the same egg

.the same stop watch

.the same spoon to help

.the distilled water from same bottle

.the same measuring cylinder

.the same room temperature

[Materials]

. 1 egg which remove the shell already                

. Spoon

. 300ml 10% NaCl solution

. 300ml 5% NaCl solution

. 300ml distilled water

. 3 250ml bickers

. Electronic balance

. Stop watch

. Paper towel

.measuring cylinder

[Method]

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1 Put the safety equipment on, such as the glasses and the apron.

2 Take the egg out of the plastic bag carefully use the paper towel to dry it carefully.

3 Place the egg on the balance and record its mass in the data table.

4 Use the measuring cylinder to measure 75ml 10% salt solution. Put them in the beaker. Then use the cylinder to measure 75ml distilled water. Put them in the same beaker.

5 Mix the solution in the beaker. Place the egg in the beaker gently so that it is fully covered and leave ...

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