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Potato Osmolarity

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by

Thanh Tran

on 12 December 2014

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Transcript of Potato Osmolarity

To study the effects of osmosis on potato's.
To find which sucrose solutions will be hypotonic or hypertonic.
Three Types of Solutions
A hypertonic solution, the solution will have a higher solute concentration than the cell, resulting in water leaving it.
A Hypotonic solution has a lower solute concentration than that of inside the cell, resulting in water entering the cell.
In an isotonic solution, the concentration of solutes is the same inside the cell as it is outside of the cell.
Before we start
Osmosis is a type of diffusion in which water disperses through a selectively permeable membrane from a high water concentration region to a region of lower water concentration
There are three different types of solutions relating to the effects of osmosis, hypertonic, hypotonic, and isotonic
Objective
Summary
To test our hypothesis we had to submerge the potato in all seven sucrose solutions and left it in there for a hour and a half. Through out the experiment we tried to submerge them simultaneously to yield the most reliable results.
Results
Procedures
Labeled 7 beakers with 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6. Poured 100 ml of each solution into their according beakers.
We cut out 7 pieces of potatoes around 5 cm long and half a centimeter wide. We made sure that there was no skin on the pieces.
We placed a paper towel to blot the sides and ends.
We then placed each piece into a beaker and waited for an hour and a half.
After an hour and a half we took the pieces out.
Finally we recorded the final weight for each of the pieces.

Discussion
According to the results the osmolarity of sucrose within the potato is near 0.3M because the solution is isotonic. The hypotonic solution ranged from 0 to 0.2 and hypertonic ranging from 0.4 to 0.6. In conclusion, our hypothesis was proven correct


Results
The initial weight of the potato slices ranged from .29g to .5g. The weight of each potato slice is slightly different, because our goal was to find the percent change in weight, which made the weight of each individual potato slice less important.
The final weight ranged from .31g to .49g . The weight of the potato slices increased in the sucrose solutions of 0.0M, 0.1M, and 0.2M making them hypotonic. The weight decreased in the solutions of 0.4M, 0.5M and 0.6M, making them hypertonic.
Introduction
The Experiment
Conclusion
Potato Osmolarity

Kimball Williams
Marisol Garcia
Abel Cuadras
Thanh Tran

Hypothesis
If the potato is placed in a sucrose solution 0.1 or 0.2, then it will be hypotonic. If the potato is placed in a sucrose solution ranging from 0.3 to 0.6, then it will be hypertonic.
If given a second chance to redo the experiment we would like to start off with the potato slices to be more exact. For example from 0.4 to 0.5 the change in weight increased significantly but still fell within range of our hypothesis. Other then that our experiment was a success
Final Thoughts
References
http://changhoon01pd2013.wikispaces.com/file/view/Osmosis+and+Diffusion+Lab+using+Potato+Cores+Lab.pdf
Symbiosis. The pearson custom library for the biological sciences
Full transcript