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# What is the osmotic pressure of the average potato?

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Introduction

Research Question: What is the osmotic pressure of the average potato? To answer the research questions, potato cylinders were cut out using cylindrical cuters, and these samples were then placed in beakers containing various concentrations of sodium chloride overnight. Each cylindrical potato sample was weighed and measured before being placed in the beaker. The scientists then would take the sample potato after being soaked overnight and weigh them to see if the solution they were soaked in to had an affect on them. This gives the difference between the weights before and after being soaked, thus providing information to determine the osmotic concentration of potatoes. ...read more.

Middle

The other five were also marked the same way but with a different color. The next step was to make the concentration. A paper towel was placed on the scale, and on the scale we weighed .5g, 1g, 2g and 3 g of sodium chloride (each one twice). Then the .5g of sodium chloride was placed in the beaker marked with .5%, and so on for each of the different weights of sodium chloride. The beaker marked with 0% was kept distilled. The glass rod was then used to distill the sodium chloride faster by stirring the water. When the sodium chloride was not seen anymore the cylindrical potato samples were placed in the beakers and left there overnight. ...read more.

Conclusion

The only two I can think of are the age of the potato and the temperature that might have had affected the rate of osmosis. The age wasn't an issue as the potatoes all seemed fresh and of the same age, and temperature stayed the same as the potatoes were inside a room, and thus maintained at room temperature. Thus we see that the osmotic concentration is of .7%. for future reference the best thing to do is to completely dissolve the sodium chloride in the water, as we didn't do so this time. To go further with the experiment testing other foods would be a good idea, such as apples, or macaroni. ...read more.

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# Related GCSE Life Processes & Cells essays

1. ## Osmotic pressure

to regions of low water concentration (or high water concentration). Osmosis is used in the uptake of water in a plants root and also in kidney dialysis machines to filter the blood. Aim- We are doing this experiment to investigate how the different sugar solutions, change the mass of potato by osmosis.

2. ## To find the osmotic pressure of potato cells.

membrane. This means that it lets small molecules e.g. water in, so osmosis occurs as long as the cell membrane is not damaged. The cytoplasm of cells contains dissolved sugar and salt so we could think of it as a weak solution. The direction of osmosis depends on the concentration of the fluid surrounding the cell.

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