14 Jun BIOLOGY
Potato Osmolarity Question: To what extent will the concentrated solution affect the mass and osmolarity of a
potato?
Background Information:
Cell transport is the process of cells moving into or out of the of the cell across the cell membrane. Cell transport divides into two brought categories, passive cell transport and active cell transport. Passive cell transport is an automatic process, which means energy is not required during the process. An example of passive cell transport would be diffusion. Diffusion is when particles move into or out of the cell from an area of higher concentration to an area of a lower concentration and the cell doesn’t use any energy during this process. Active transport is when cells move from an area of a lower concentration to an area of a higher concentration and it does require energy.
Hypothesis:
If the potato is placed in a concentrated sucrose of 0.8 or 0.6 then it will be hypertonic solution, but if it’s placed in a concentrated sucrose of 0.2 or 0.4 then it will be a hypotonic solution.
Variables:
Independent: – Concentration of sucrose
Controlled: – Amount of sucrose solution (20 ml)
– Potato
· – Room temperature
· – Amount of time in solution
Dependent:
– Percent change in mass
Materials:
· – Beakers/tubes
· – Concentrated sucrose solution
· – Potato
· – Ruler
· – Scalpel
· – Cork borer
· – Paper towel
· – Balance
Procedure:
1. Label the beakers/tubes of sucrose you will use.
2. Measure and record the sucrose solution volume in column 2 of the table.
3. Cut a piece of the potato using the cork borer and measure it to fit it into your
beaker/tube.
4. Weigh the potato piece using a balance, record your data, and put it in the beakers. Fill
your tube with the sucrose solution and make sure that the solution totally cover the
potato.
5. Leave it for 24 hours.
6. Take out one piece from one of the beakers and dry it on a paper towel (do for all five but
one at a time).
7. Reweigh the potato piece using a balance and record the mass of the potato piece.
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8. After you finish all five, calculate the change in mass and then the percentage change in mass of each set of potato pieces.
9. Average the 5 trials from using other groups data and graph it.
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