Plant cells tend to achieve this. In a solution with more than one solute, sum the concentrations of all the solutes to determine the total solute concentration. Cell, Dialysis tubing, Diffusion 1322 Words 4 Pages Potato osmosis report Operators Introduction The purpose of the liberation Liberation is to understand what is happening with the potatoes when it is in the water. Instructions First, lay out your two plates and fill them both with the same amount of water. I will expect the potato that had been in the strongest solution to have experienced a slight loss in mass and length, and become flaccid feeling soft and 'flabby' to the touch. The potatoes were left overnight in their beakers, and were removed and weighed 24 hours later.
Examine the relation of membrane permeability to diffusion and osmosis. Conversely, they will lose water when in concentrated solutions, such as those containing a great deal of starch. Over time, the water on the left, containing less salt, will diffuse through the semipermeable membrane into the side of the container with a higher concentration of salt. We were able to experiment and discover that the potato slices immersed in the lower glucose solutions, yielded to a higher mass than the ones immersed in the higher glucose solution due to the particles moving from an area of higher concentration to a lower one. Plant cells react to osmosis by hypertonic, isotonic and hypotonic. The pressure exerted by this movement can be relatively high. This preliminary will aid my prediction, which is stated below.
Prediction In this investigation, I want to find out how the concentration of the salt solution outside the potato affects the amount of osmosis taking place in a certain amount of time the rate. I think this will occur because a higher water concentration has a higher number of water particles in it, thus there will be more movement of water particles and therefore a faster rate of osmosis. Conclusion The purpose of this experiment was to compare the rate of osmosis between different temperatures. Water crosses the cell membrane in both directions, but the amount going in is the same as the amount going out. I predict that when the sugar solution is 0% the mass will increase as there is less sugar in the.
Then, we will wait two hours, and get our result. We hypothesized that in both labs the solutions with a larger glucose concentration would gain more mass due to the hypotonic nature of the solutions. A 1% salt solution is 1 part salt to 100 parts water. Prediction I predict that when the sucrose concentration is low the potato chip will gain mass. The potato that was soaking in the freshwater will be slightly more dense, and with the same fresh white-ish color as before.
Take the bag out of the water every five minutes and record the mass of the bag for fifteen minutes 8. If a cell is placed in an environment in which the concentration of water is less than in the cell hypertonic , water will flow from the cytoplasm. Â· To gain an average do this test a couple of times. The mass and length of the potato piece must be kept the same in each experiment primarily because they affect the surface area of the piece, and varying surface area could have a great effect on the rate of osmosis. The amount of time left in the solution is a variable that needs to be kept the same because we are measuring the rate of osmosis; the amount that occurs in a given time, and if that time is not constant throughout the different experiments of the investigation, we are not getting an accurate picture of the rate.
The data shows that the rate of osmosis was the greatest at room temperature at about a 44% change. Explanation of osmosis For osmosis to occur there must be; semi-permeable membranes are very thin layers of material cell membranes are semi-permeable which allow some things to pass through them but prevent from passing through. The container is filled with water on both sides, with the side on the left containing a low concentration of salt, and the container on the right containing a high concentration of salt. By using potatoes as a model, we were able to note the change in mass of each potato slice before and after the overnight immersion. Out of the graphs produced the length one was the most accurate with it showing with it showing that the potato does get smaller and become flaccid, and the opposite way round, i.
If a trend line were to be added to the average size change graph it would be a straight diagonal line which is what should happen. This is therefore the only thing that is going to be altered as I am investigating how different percentage of water molecules affects the weight of the the potato thus the rate and direction of osmosis. If you insert a barrier into the container through which they can pass, they will do so. In light of this, I have decided to place the three potato pieces on a wire, in order to keep them in place and ensure that the whole surface of each piece of potato is in the solution. The average diffusion rate was. As for the boiled potato, it will show a change by absorbing the water and displaying Osmosis Procedure Purpose The Purpose of this experiment is to investigate if Osmosis will occur best with a boiled potato or a raw potato in water.
However, if the concentration of inside the cell is lower than the outside, water will not move into the cell. But: temperature also changes equilibrium. Planning, Ideas and Preliminary Testing I have performed some preliminary tests in which I set up the experiment with potato pieces in a solution of low water concentration and one of high water concentration. The most important concern of the lab was dealing with the hot water so goggles and lab aprons had to be worn during the lab. To investigate the range of solutions needed to find the point at which the surrounding solution is the same as the cell sap in the vacuole. Furthermore, the main process of passive transport is diffusion, which involves the movement of dissolved particles through a semi-permeable membrane from that of a high concentration to a low concentration. Chemistry, Concentration, Mass 1806 Words 6 Pages Biology Coursework: Effect of Sugar Solution on Potato Chips Planning Before planning the experiment, I will research osmosis, so that I can make predictions.