Investigate the Osmosis of Potato Cells in Various Salt Solutions
Introduction
I have been asked to investigate the effect of changing the concentration of a solution on the movement of water into and out of potato cells. I will be able to change the input of my experiment.
The input variable will be the concentration of the solution. The
100% solution is sodium chloride dissolved in water (salt water).
This will be referred to as the 100% solution from now on. But the type of solution is not important as Osmosis is all about differences in concentrations. The output variable will be the weight of the potato chips, the movement of the water into and out of the potato.
Osmosis is the diffusion of water through a semi-permeable membrane from high concentration of water to a low concentration of water. The water molecules move freely through the semi-permeable membrane this is a passive process. We will do this experiment by placing potato chips in different strength solutions and checking for mass increase/decrease.
Prediction
I hypothesize that if we place potato chips in different strength solutions that there should be different results, some with noticeable changes in mass the other will be nearly the same. The potatoes should gain/lose mass by the movement of water. If there is a change in mass it is because water has entered or left the cell. So the experiment will be based upon the movement of water.
The first potato chip will be placed in a zero percent solution. I believe that this will increase the mass. I believe this because the zero percent solution has a lower concentration then the cell sap inside the potato. The potato takes on the water through Osmosis and the cell pushes out from inside the cell making it swell and become more rigid.
The second potato chip will be placed in a fifty percent solution. I believe that the mass will not change for this potato chip because the concentration of the cell sap and the solution is nearly the same.
This means the concentration will be nearly even inside and outside the cell. But this does not mean that osmosis is not taking place.
Osmosis is the movement of water, the water still moves between the semi-permeable membranes.
The third potato chip will be placed in a hundred percent solution. I believe that this will make the potato chip shrivel and become flexible and stringy. This is because t...
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...surface area will take on more water in a set time. For example if a potato chip is cut in a wavy shape or is crinkled it could have the same weight as any other potato chip but it would have a larger surface area. This could affect your results.
So you must be careful in cutting the same shape potato chips. The slight difference in our experiment was negligible so we did not take it into account but it might have helped to make one of those anomalous results.
All the anomalous results were negligible. They could be caused by anything. Form a slight increase in room temperature to the cell membrane being damaged when being cut. If I were to repeat this experiment I would try to make sure there are no anomalous results.
The experiment would take a longer time and would be conducted in a sterile lab where there are no possible ways of the experiment being effected. In conclusion the experiment was a success we got the results we expected and they proved our hypothesis. But this experiment could always be repeated maybe on a much larger scale over and over again.
This experiment suggests that there is a connection between the concentration of a solution and the movement of water.
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The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
Osmosis Experiment Planning Aim: The main subject that I will be planning to investigate is the effects of a concentrated sucrose solution on potato cells on the basis of the Osmosis theory. Background knowledge: The plant cell and its structure To understand osmosis in detail I will need to explain the plant cell (which is the cell included in the osmosis experiment) and its cell membrane. Below I have a diagram of a plant cell: [IMAGE] Osmosis is about the movement of particles from a higher concentrated solution to a lower concentrated solution to create an ethical balance via a partially or semi permeable cell membrane. Osmosis in simple terms is the exchange of particles between the cytoplasm inside the cell and the solution outside the cell. What makes this exhange is the partially permable cell membrane.
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When doing this experiment I was able to see the effect of different concentrations on the rate of osmosis, each was done by measuring the initial mass and length of the potato cylinder and after osmosis, the results were conducted to show that as the sucrose concentration increases the rate of osmosis also increases as I said in my hypothesis thusly making a direct decrease in mass.
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When I am not using them I will place them away from my experiment and
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with 0.0M (distilled water) and go up by 0.1M until I reach 1.0M and I
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Cosmetic Surgery has been around ever since the early wars to repair scars and injuries but, “today, cosmetic plastic surgeries outnumber reconstructive ones in many countries.” (Edmonds, 2012, p. 134). Cosmetic surgery continues to grow in popularity all around the world. It has now evolved to beautify an unattractive physical appearance. In 2013, Americans spent more than seven billion dollars on cosmetic surgery according to a website titled, Healthline. Cosmetic surgery may sound ideal to someone who is unhappy with a physical appearance but it can be very dangerous. According to “The Culture of Beauty”, “analysts agree that because
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Prediction I think that when the potato is placed in distilled water the potato mass will increase. This is because water, has, if pure, a weaker concentration than the potato, and the water molecules move in through a partially permeable membrane by osmosis. If the potato is in a high concentration salt solution, the potato mass will decrease because the potato is less concentrated than the salt solution, and the water will move through the partially permeable membrane into the stronger solution. However, if the potato mass stays the same after the experiment, this means that the water/salt solution and the potato must be of equal concentration.