Find out if different concentrations of sucrose solution cause a selectively permeable membrane, in this case a potato chip, to become larger or smaller.

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Osmossis experiment

PLAN

Investigation.

I intend to find out if different concentrations of sucrose solution cause a selectively permeable membrane, in this case a potato chip, to become larger or smaller.

I plan to use six different concentrations of sucrose solution and for each concentration I will take three results. I will then find the percentage change for each result. Finally I will find the average weight change and the average percentage change.

Prediction.

I predict that the lower concentrations of sucrose solution will cause the chip to become larger and the higher concentrations will cause the chip to become smaller.

Fair test.

To create a fair test certain aspects of the experiment will have to be kept the same whilst one key variable is changed. We have chosen to vary the concentration of the sucrose solution.

For the purpose of my experiment I am going to carry out all the experiments at the same time so the temperature is kept almost the same throughout.

The mass of the potato is a dependent variable. This means that it will be measured throughout the experiment. I will measure the mass in grams. The potato chip will be measured before it is put in the solution, and after. This will allow us to see whether osmosis has taken place, and to what extent. The volume of the solution that the potato chips are kept in must be the same. The potato chip must be totally covered in the solution, and the amount of solution will be kept the same because
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all the potato chips will be the same size. I am also going to use the same balance to weigh my potato chips. This is because the measurements may slightly vary between different sets of scales.

Apparatus.

· 6 petri dishes (with lids)

· 150ml beaker

· Ruler

· Scalpel

· Small cutting board · Core borer

· Sticky labels

· Sucrose solution

· Measuring cylinder (100cm3)

Diagram.

Conversion table.

Concentration

Water (cm3)

Sucrose (cm3)

0.0

30

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