Using Sucrose Solutions to Determine Osmolarity of Potato Tubers Based on Weight By Thomas Pelikan Biology 200A Section 004 Kimberly Schmidt October 2‚ 2012 Abstract: In this experiment we were trying to determine the osmolarity of potato tubers by weighing them before and after incubating them in solutions of sucrose with varying molarities. To find the osmolarity we took a potato and used a cork borer to obtain seven samples of potato tubers. We then prepared seven beakers with concentrations
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perhaps the single most important molecule in any living system (Hayden and McNeil 2012). Since water molecules are so small‚ they are constantly going into and out of the cell. Osmosis is a situation where more water molecules are moving across the membrane in one direction than the other (Hayden and McNeil 2012). During osmosis the net movement of water molecules will be from a solution that has a lower osmotic concentration to a solution that has a higher osmotic concentration. When a solution has
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down sucrose is too large of a molecule to diffuse through semi permeable membrane and wouldn’t be able move in and out of cells affectively. Because potatoes have sucrose inside them a concentration gradient is present and if placed in any solution osmosis movement of water through semi permeable membranes would naturally occur. If the concentration of sucrose in the solutions is less than the concentration in the potato then the potato will gain mass and vice versa. In conducting this experiment sucrose
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Education 28: 83 – 85. Bland‚ W. and C. B. Tanner (1985) Measurement of the water potential of stored potato tubers. Plant Physiology 79: 891-895. Boyer‚ JS (1969) Measurement of the water status of plants. ARPP 20:351-364. Koning‚ R (1999) Web Site: Osmosis Lab. Kramer‚ P (1983) Water Relations of Plants. Academic Press‚ NY. Meidner‚ H (1984) Class Experiments in Plant Physiology. George Albert Unwin‚ Boston. Reiss‚ Carol (1994) Experiments in Plant Physiology. Prentice-Hall‚ Englewood Cliffs‚ NJ. Ross
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Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus‚ diffusion should not be confused with convection or advection‚ which are other transport mechanisms that use bulk motion to move particles from one place to another. In Latin‚ "diffundere" means "to spread out". There are two ways to introduce the notion of diffusion: either a phenomenological approach starting
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beaker into the sac‚ where its concentration was lower. This caused the fluid column to rise in the tube. 12) Define the following terms: Diffusion: Movement of molecules from an area higher concentration to an area of lower concentration. Osmosis: Diffusion of water through a water permeable membrane from higher concentration to an area of lower water concentration. Simple diffusion: Movement of molecules from higher concentration to a lower concentration. Uses kinetic energy of the diffusing
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Cell Membranes and Transport Hands-On Labs‚ Inc. Version 42-0033-00-01 Exercise 1: Diffusion Observations Data Table 1: Rate of diffusion in different temperatures | | ºC | Minutes | Temperature | InitialTemp. | InitialColor | 5 | 10 | 15 | 20 | 25 | 30 | 60 | Cold | 10°celsius | clear | clear | clear | clear | clear | clear | light purple | light purple | Ambient | 25°celsius
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The Effect of Solute Concentration on the Mass of Apples Introduction Background: This lab involves the testing and measuring of water potential. Water potential (ψ) is the tendency of water to diffuse from one region to another. It measures the free energy available in water to do work. Pure water has a water potential of 0 (kpa--unit?). Water will move from an area of higher water potential to an area of lower water potential. Several factors‚ including temperature‚ pressure (ψp) and solute concentration
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Caroline Phillips Lab 3: The Cell Purpose During this lab I hope to acquire a complete understanding of the makeup of the cell and all of its functions. Hypothesis If I complete this lab‚ then I will have a full understanding of the topics covered in the chapter “The Cell” and will have a complete understanding of the makeup of the cell and all of its functions. Materials & Methods Materials: “Human Anatomy & Physiology ninth edition” Elaine N. Marieb; Katja Hoehn Methods:
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Name:_______________________ Date:___________ Period:______ Page:_______ Potato Diffusion Lab Hypothesis:________________________________________________________________________ __________________________________________________________________________________ Materials Aprons/Goggles Potato Slice (2-3cm thick) Potato Borer Triple beam balance 6 x 100mL beakers plastic wrap Paper towel 50mL Distilled Water 50mL 0.2M Sucrose solution 50mL 0.4M Sucrose solution 50mL 0.6M Sucrose
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