Diffusion and Osmosis: A Full Analysis on the Concentration of Solutes and the Molecular Weight of Substances in a Dialysis Tubing and Potato Experiment Alejandro Gonzalez October 30, 2012 Biology 1500 Professor Raja Abstract The purpose of the diffusion and osmosis lab experiments is to determine the contents present before and after leaving a dialysis tubing in a beaker of solution and to test water potential by determining the percent change in mass of potatoes when left in different
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For this experiment, we test the effects of immersing a potato in a hypertonic, hypotonic, and an isotonic solution. The concept we take into account for this experiment is osmosis regulation of water. Osmosis is the movement of water molecules across a semi permeable membrane from a higher concentration of water to a lower concentration of water. This movement follows the concentration gradient. Ψw = Ψs + Ψp, this equation relates the water potential Ψw, together with the solute potential, Ψs and
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the potato- a 0% increase in weight. This shows that the concentration of the solution is the same as the concentration in the potato. From this I can conclude that the concentration inside the potato is 0.4 molar. These findings supportmy prediction however I was not sure of the exact concentration and now I have a better estimate, but the general trend is the same. The general trend being, as seen on the graph, that the higher the concentration of sucrose the more weight lost by the potato. This
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positive in order to match the test solution. Due to the exposure of the hypotonic solution in Solution A, the potato increased from 2.71 ± 0.01 grams to 3.01 ± 0.01 grams. Through osmosis, the water molecules moves from the solution into the potato cells’ semi-permeable membrane which exists across the concentration gradient in order to reach an isotonic state. This lead to the potato increasing in relative weight and size to its prior form. With my data’s evidence,
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Diffusion And Osmosis Introduction: There are several valuable aspects of this lab that must be understood before it is conducted. The first of these concepts is called diffusion. Molecules are constantly moving and as they are moving they tend to move from areas of higher concentration to areas of lower concentration. Diffusion can be defined as the net movement of molecules from higher to lower concentrations. One example, of diffusion is when an item like perfume is opened in a room.
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MY BIOLOGY S.B.A Lab #1 Topic: Classification Aim: To classify organisms into groups Apparatus: Method: A list of 10 organisms in my school environment was made and observed. A table was constructed to show the organism and their visible characteristics. Another table was constructed to show the kingdom, phylum and class to which the organisms belong. Observation Organism | Visible Characteristics | Bird | They are vertebrates with a pair of wings. They also have a beak | Cat |
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Life 120 Lab #1 “Cell Structure and Function And Movement of Materials across Cell Membranes” 1-20-15 Plant Cell Structure Abstract: In cells, water will move from areas of high concentration to areas of low concentration. This was addressed by observing the changes in cells as they were surrounded by NaCl solution and later by a water solution. The results support our hypothesis and show that the composition of the surroundings has a visible (under a microscope) effect on the shape
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Marisa M Souza AP Biology Mrs.Therrien October, 6, 2015 Diffusion and Osmosis Exercise 1A: Diffusion In our diffusion experiment glucose is leaving the bag and Iodine-Potassium-Iodide or IKI is entering the bag. The change in color within the bag indicates the presence of glucose. The IKI moved from the beaker into the dialysis bag, this resulted in a change of color to black within the bag. This made the concentration within the bag equal to the concentration outside the bag. The glucose
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which signifies that they were plasmolysed. This means that water diffused from the potato, into the sucrose solution, so these sucrose solutions must be hypertonic. The potatoes in the green and purple solutions were slightly softer, which signifies that they were flaccid. This means that the green and purple solutions were isotonic to the potatoes. The potatoes in the brown solution were firm, signifying that the cells were turgid, and the solution was therefore
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Introduction Most aspects of a cell depend on the fact that atoms and molecules have kinetic energy and are constantly in motion. Kinetic energy causes molecules to bump into each other and move into different places. Diffusion is the random movement of molecules from an area of higher concentration to an area of lower concentration. Cells have selectively permeable membranes that only allow the movement of certain solutes. Diffusion is vital for many of life’s functions in a cell. It allows oxygen and carbon
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