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Transcript of Potato Osmosis
Problem and Hypothesis
Problem: We do not completely understand the water potential in the potato cells.
Hypothesis: If the potatoes are each placed in their solutions, then the water will flow from the less concentrated to the more concentrated solution, and therefore the mass will increase in the more concentrated solution.
Mass of Potato Cores vs. Sucrose Molarity
The percentages throughout the graph remained at or near 40% four out of six times. This graph shows the mass of all six of the one centimeter by one centimeter potato cores correlating with the different molarities of sucrose. For the first two molarities, the percentage of mass remained at 40%, the it suddenly dropped to 20% on the third trial. Come the third trial, it jumped right back up to 40% for the third and fourth trial. At the final molarity, the percentage dropped back down to 0%.
Average Mass of the Potato Cores
Observations and Research
Some lost a little coloration
Non-turgid slices were softer
The potato in the distilled water expanded slightly
Volumes of Water:
0% - 20.5mL
2% - 17mL
4% - 18mL
6% - 19mL
10% - 17.5mL
Materials and Procedures
100 milliliters of solution
Pour 100mL of your assigned solutions into a beaker. Slice the potato into four equal cubes.
Determine and record the mass of all four slices.
Place cubes into the beaker with the solution and cover with plastic wrap. Let set over night.
Remove cubes from solution and clean them off. Record the temperature in Celsius.
Determine and record the mass of the four cubes again.
Calculate the percent change.
Graph the results.
Osmosis - A form of diffusion ; the net movement of water or any small molecule across a partially permeable membrane from a region of low concentration to a region of higher concentration.
Turgor - When osmosis occurs in a plant cell after it has been watered, the water (which is less concentrated) enters the vacuole which therefore results in that the vacuole is erected to its full size.
Plasmolysis - When a plant is put in a solution that is more concentrated than it, it loses the water stored in its vacuoles and therefore becomes Plasmolysed. When this happens, which never occurs naturally, the
plant becomes weak, dry and limp.
Isotonic: The solutions being compared have equal concentration of solutes.
Hypertonic: The solution with the higher concentration of solutes.
Hypotonic: The solution with the lower concentration of solutes
We therefore conclude upon the light of the observations from our
experiment that our predictions and hypothesis were correct and that
water flows from the less concentrated to the more concentrated
solution, and therefore the mass increases in the more concentrated
In our Potato Osmosis Lab, we were dealing with distilled water and sucrose molarity in different solutions. Our results of the mass of the cube of potato with just distilled water and zero sucrose started at 1.1g as the initial mass and a final mass of 1.5g, a .4g difference and 40% increase in size. The potato cube in the distilled water and 2% sucrose initial size was .9g; the final mass was 1.3g, a .4g difference and a 40% change in the mass. In the distilled water with 4% sucrose the size started at .7g then the final size was .9g, a .2g difference and 20% increase in mass. The potato in distilled water and 6% sucrose had an initial mass of 1g and final mass of 1.4g, a .4g difference and a 40% increase in size. The cube in distilled water and 8% sucrose started at a size of .9g then grew to 1.3g; a .4g and 40% increase in mass. The potato cube in distilled water and 10% sucrose had an initial mass of 1g, and a final mass of 1g, 0 difference in mass and 0% change in mass.