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Investigating Osmosis
Aim
To find out how osmosis affects the mass of a chip through different
sugar solutions.
Apparatus
Petri dishes (6)
Chips
Ruler
Thermometer
30 cm3 Solutions (6) DI, 0.2, 0.4, 0.6, 0.8, 1M
Measuring Cylinder
Knife
Weighing scales
Definition
Osmosis is the movement of water molecules from a high concentration
of water molecules to a lower concentration of water molecules through
a semi-permeable membrane.
Prelims
Before doing this practical, I did a preliminary experiment. This was
to help with my prediction and also to improve my main practical.
This experiment was quick. It was just the same as the actual
practical but it helped me to change certain things. I recorded 3
different changes in mass of the chips in each of the solutions at
different times.
DI
0.2 m
0.4 m
0.6 m
0.8 m
1m
4cm
4cm
4cm
4cm
4cm
4cm
1 hour
4cm
4cm
4cm
4cm
4cm
4cm
1 1/2 hours
4.1cm
4cm
4cm
3.8cm
3.8cm
3.6cm
2 hours
4 cm
3.9cm
3.5cm
3.6cm
3.4cm
3.2cm
I’ve now decided to weigh the chips at the start and finish. This is
to get more accurate readings. It will be easier to spot any
anomalous results if one chip is compared to two others. I have
decided to leave the chips in the solution for a longer period of time
(overnight) I found that the longer I left the chips in the solution
the more the mass changed. I did this to get more accurate results.
Variables
The only thing verifying in this experiment is going to be the
concentration of the sugar in each of the solutions in the 6 different