The Concentration of the Contents of a Potato Cell

The Concentration of the Contents of a Potato Cell

Plan

I am going to use a range of concentrations to enable me to get a good

result. I will do this experiment twice to get an accurate answer.

Prediction

The passing through a semi-permeable membrane of high concentration

and low concentration to an equal concentration is called Osmoses.

Because of the balancing out of weight I predict that the weighted of

the potato in the lower concentrations will increase and the weight of

the potato in the higher concentration will decrease. My groups

preliminary experiment showed me that my predictions where correct. We

used concentrations of 5%, 10%, 15% and 20%.

Method

Using a measuring cylinder I will measure 50ml of concentrated water

into ten small beakers. Each percentage will be repeated so that I can

get a more accurate result. I will cut as near as possible to 4mm

circles from the potato. Before I place them into the water and sugar

solution I will weigh them and re-zero the scales between each piece.

I want to do this experiment fairly and accurate.

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Apparatus

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4% 8% 12% 15% 20%

By Claire Watson 11W

An experiment to find the concentration of the contents of a potato

cell

Result

Before

After

% change

A 4%

2.16g

2.27g

+5.09%

B 8%

2.33g

2.36g

+1.28%

C 12 %

2.16g

2.02g

-3.51%

D 16%

2.17g

1.75g

-0.64%

E 20%

2.07g

1.38g

-6.66%

Before

After

% change

A 4%

2.50g

2.62g

+4.80%

B 8%

2.60g

2.62g

+0.76%

C 12 %

2.55g

2.39g

-3.72%