Hypothesis Â· A potato chip left in a low concentration of sugar solution will gain mass where as a potato chip left in a high concentration of sugar solution will lose mass. I think the graph will look like this but there will be no plasmolysed on my graph, as I do no expect my measurements to go that far. Prior to the experiment we carried out a short pilot test, using potato chips and solutions of strength 0. This will hopefully produce more accurate results from which I will be able to draw a more accurate conclusion. At least 70% of the mass of living organisms is water, and almost all of chemical reaction of life takes place in an aqueous solution.
At the beginning of the experiment all the potato chips will be 2mg in mass. To make the process of removing them from the sugar solution easier and faster for more accuracy, the potato chips will be attached to a string tied around a stand placed above the beaker. I also predict that a potato chip which is placed in the sugar solution will loose weight and be very soft because water will have moved out of the chip into the sugar solution by osmosis. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules such as water through but does not allow bigger molecules to pass through. The chip must be totally covered in the solution, and the amount of solution will be kept the same because all the chips are the same size. The eggs were soaked in vinegar to remove the outside hard shell but still leave the egg in its membrane.
They are shown below: ChipSolution 1Water 21. This would ensure that I have an accurate amount of fluid in each test tube. Hypothesis: I believe that the more saturated the solution is the lighter the potato will be, and the potato in the clear water will weigh more after being left in the solution over a 24 hour period. The potato chip will increase in length, and weight due to osmosis. This is to be placed into the test tube. If I were to repeat the experiment ideally if possible I would use a machine to cut the potatoes allowing perfect sizes and dimensions enabling a perfectly fair experiment.
This is where no osmosis is taking place; both the potato and the solution have an identical molar concentration. This shows that the sugar solution has a weak water potential and that osmosis took place. Â· A hypertonic solution has lower water potential. This preliminary will aid my prediction… Osmosis in Potato Tubers Andrew Dickson Background When a plant cell is bathed in a solution of the same concentration isotonic as its intracellular environment, its mass and volume remain the same. Measure them as accurately as possible.
I am going to carry out my investigation twice to improve the reliability of all my results. This resistance results in turgor pressure exerted by the vacuole on the cell walls. I will carefully slice twelve bits of potatoes at the measurement of 3cm and weigh them at 3grams on the top pan balance. Turgid means swollen and hard. Reasoning: Since the potato chips have a higher concentration of sugar, water molecules from the solution will diffuse into the potato chips until they are both at the same concentration.
As you can see as the molar concentration increases the change in mass decreases. Record all results accurately and work out an average for each concentration average weight of chip after testing. I think there will be a negative correlation between the two. This way would have allowed me to also find out the isotonic point far more accurately as the one that I estimated is very approximate. The mood of the person experimenting could possibly alter the results. Aim I aim to investigate the effect of different concentrations of salt solution on potato cells when osmosis occurs. Therefore the distilled water solution will has the greatest mass and the higher the concentration that the chip is exposed to, the more water will move out of the chip; making it flaccid so the 10% chip will become flaccid.
I am also going to investigate on how potato chips change in volume and weight when placed in different concentrations of sucrose solution. The student should try to ensure all units and concentrations are clearly recorded. You can modify this activity to show the rate of movement of water by osmosis. I am going to keep each potato chip in each solution for 24hours. Both of the results show a negative correlation. . I have decided to measure the volume of solution instead of the length for my actual experiment, because the volume of solution is a lot easier and quicker to measure and is also more accurate.
As the turgor pressure increases water will begin to diffuse out of the cell at a greater rate, eventually equilibrium will be reached and water will enter and leave the cell at the same rate. This wall pressure is called turgor pressure and the internal outward force on the wall is called osmotic pressure. Introduction I intent to set up this experiment using equally sized cylinders of potato submerged in salt solutions of different concentrations. This will allow us to see whether osmosis has taken place, and how much osmosis has occurred. It would have been better to only use one method of recording the dependent variable.
I think I took easily enough results for the amount of concentrations that I was using, and the time that I used for the experiment to last was enough to allow sufficient osmosis to occur. Scientific knowledge: Osmosis is a type of diffusion, where the molecules move from an area of high concentration to an area of low concentration passing through a partially permeable membrane. Introduction To carry out my experiment, I will place the potato tubes into a solution containing part sucrose and part water. Preliminary The main objective of carrying out four preliminary experiments was to inform me as to which instruments would be most efficient in its use, gain first hand practice and recognize suitable methods in order to conclude specified measures which I will be using in ensuring that my final investigation is of highest standards in its reliability. The plant cell swells and shall become turgid to the extent that the pressure within the cell matches the internal or turgor pressure. The gradient does change in my graph.
This tells us the water potential is higher inside of the potatoes, so water as left the potato strips by osmosis. This is the reason plant roots take in water: the rain water the enters the soil has a higher water potential than inside of the roots, so water moves into the roots by osmosis. Planning: In this experiment I will be trying to find out the osmotic properties of a potato. To process the data you need a table of results with all concentrations listed, as well as the starting lengths of the strips. Passive transport includes osmosis and facilitates diffusion.