# Osmosis Lab Essay Research Paper Osmosis Lab

СОДЕРЖАНИЕ: Osmosis Lab Essay, Research Paper Osmosis Lab Purpose The purpose of this lab is to determine the concentration of solutes inside of a potato s cell. We also want to know the composition of potato water and stuff . Also the scientific Phenomenon studied of diffusion/ Osmosis. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration.

Osmosis Lab Essay, Research Paper

3 1.12 2.40 1.28 8.05% 4 1.12 2.35 1.23 15.2% 5 1.12 2.35 1.23 22.6%Fig. 1- this chart shows the weight of the potato and the patter used to weigh it, as well as where each potato went into of solute.(Day 2)Potato mass in grams: Potato in Mass No sugar 1.94 .75 1.651.61 1.543.04 1.114.52 1.00Fig. 1- this chart shows the potatoes mass gathered in day two. To calculate percent change in massEquation: Mass Day 2 – Mass Day 1 x 100 Mass Day 1 Potato in 0% solute: 1.94 – 1.33 x 100 = 45.9% 1.33Potato in 3.75% solute: 1.65 – 1.29 x 100 = 27.9% 1.29Potato in 8.05% solute: 1.45 – 1.28 x 100 = 20.9% 1.28Potato in 15.2% solute: 1.11 – 1.23 x 100 = -9.76% 1.23Potato in 22.6% solute: 1.00 – 1.23 x 100 = -21.6% 1.23 Observations for day twoPotato in test tube with no sugar: This potato spear is stiff, and is bigger on one side than the other. There seems to be a foul odor coming from this test tube.Potato in .75g test tube: The potato is a little stiff to our surprise. One side appears to be thicker than the other is. The potato looks fuzzy.Potato in 1.61g test tube: The potato is a little stiff. One side appears to be thicker than the other is. There seems to be little oxygen bubbles found in the water.Potato in 3.04g test tube: The potato is surprisingly limp. Both sides appear to be the same thickness.Potato 4.52g test tube: The potato is also very limp. At the top of the water there appears to be a white cloud of some sort. Interpretation of data: Both living and nonliving things are composed of molecules made from chemical elements such as carbon, hydrogen, oxygen, and nitrogen. The organization of these molecules into cells is one feature that distinguishes living things from all other matter. A cell is the smallest unit of matter that can carry on all of the process of life. A cell cannot survive if it is totally isolated from its environment. All cells must take in nutrients and other materials, and they must also dispose of the wastes they produce. Therefore, both nutrients and wastes must pass through the cell membrane. The cell membrane controls the ease with which substances pass into and out of the cell-some substances easily cross the membrane, while others cannot cross at all. This is the reason behind diffusion. A potato cell has what we call starch granules, which are too big to go through the cell membrane. The only thing that can go through is water or osmosis. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. Osmosis is process by which water molecules diffuse across a cell membrane from an area of higher concentration to an area of lower concentration. The more glucose put in with the potato the more mass the potato will lose. According to graph #2 when the solute percents went up the mass of the potato went down. According to my data (see graph #1) where from the equation 0= -3.0151x + 42.458. The percent solute in the potato is 14.08%. According to class data graph (see graph #2) with the equation 0 = -1.4973x + 23.953. The percent solute in the potato is 15.99% in the potato. Equilibrium is when the concentration the molecules of a substance is the same throughout a space. It is significant to answering the question in this lab, because equilibrium (isotonic) is what the cell is trying to get too. In order to make this lab easier to read for you the reader, there is a few words that I should describe for you. A solution is a mixture in which one or more substances are uniformly distributes in another substance. Solute is the substance in which the solute is dissolved. When the concentration of solute molecules outside the cell is lower than the concentration in the cytosol, the solution outside is Hypotonic. When the concentration of solute molecules outside the cell is higher the concentration in the cytosol, the solution outside is hypertonic. Isotonic is when it is all equal in and outside the cell. When the concentration is different from that of the potato then it would be a time for osmosis to occur. After the potato has reached the equilibrium point the mass of the potato would have changed from the original mass. Anything with 10% solute or more will lose mass. There are a few things that may have cause data error. Such as when reading the balance there could have been some gunk left over from past experiments and since were using such small measurements. This could effect the weight and make the reading of the weight a little different, and this would change some things around. Such as at what rate diffusion occurs. Another data error could be human error, such as partners giving each other the wrong information. And last but not least, is that all the potato spears weren’t cut exactly alike. So if we could of cut them more alike then the data would be more precise. Conclusion The purpose of this lab was to determine the percent of concentration of solute in a potato cell by placing the potato spears in differnently labeled test tubes, with different amounts of sugar of sugar solution. This lab also helped with the study of osmosis. The data showed that in general, a potato does contain a certain percent of water and a certain percent of solutes. According to #3.

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