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Osmosis Lab

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Osmosis Lab
Osmosis Design Lab
November 19, 2011
Biology

Defining the Problem and Selecting the Variables

Research Question: What will happen to mass of the cell when it is placed in different solutions while trying to reach equilibrium?

Background Information Osmosis is the procedure where water or different types of liquids move through a semipermeable membrane. This type of passage is considered as simple diffusion where no energy is required. This means that the liquid will have to leave the cell or enter it so that equilibrium can be reached. Equilibrium is the state reached when the amount of concentration is equal between the cell and the solution it is placed in. When the concentration which is the solute has the same exact concentration of the cell which is the solvent the solution is known to be an isotonic solution. When the concentration of the solute is greater than the concentration of the solvent the solution is known to be a hypertonic solution. Finally, when the concentration of the solute is lower than the concentration of the solvent the solution is known to be a hypotonic solution. Therefore, hypertonic and hypotonic solutions aren’t at equilibrium.

Variables * Independent * The change in solution in milliliters * Dependent * The change in mass in grams * Controlled * Amount of solution in milliliter * Same potato was used * Initial mass of the potato slice in grams * Temperature of the solution in Co * Same amount of time where the potato stays in the solution in minutes

Hypothesis “If the solution that the potato slice is placed in changes then the mass of the potato will increase or decrease. “

Qualitative and Quantitative Data * Qualitative Data * Change in the color of the potato * Change in the shape of the potato * Quantitative Data * Change in the mass of the potato

Relating the Hypothesis to the Scientific Theory When the mass of the potato slice


Cited: "Lab 1." Chemistry Land Intro. Web. 19 Nov. 2011. <http://www.chemistryland.com/CHM130FieldLab/Lab1/Lab1.html>. Janiszewski, Peter. "How Much Salt Is in Your Fast Food? | Obesity Panacea." PLoS Blogs Network. Web. 19 Nov. 2011. <http://blogs.plos.org/obesitypanacea/2010/10/06/how- much-salt-is-in-your- fast-food/>. "Refined Corn Oil - Suppliers, Manufacturers, Vendors, Factory, Importers, Exporters."Home - B2BManufacturerDirectory.Web.19Nov.2011.<http://www.bridgat.com/refined_corn_o il-o252933.html>. "Hexavalent Chromium Found in Drinking Water of 31 Cities by Environmental Working Group." Brainz — Learn Something New Today. Web. 19 Nov. 2011. <http://brainz.org/news/tap-water-in-31-us-cities-contains-carcinogen-hexavalent- chromium/4312/>. "Lemon Juice." Complete Health Tips. Web. 19 Nov. 2011. <http://www.eric- mccormack.net/tag/lemon- juice>. "Got Vinegar?" Homemade Mamas. Web. 19 Nov. 2011. <http://www.homemademamas.net/2011/01/got-vinegar.html>. "How Many Calories In A Potato?" How Many Calories Should I Eat A Day To Lose Weight. Web. 19 Nov. 2011. <http://howmanycaloriesshouldieatadayinfo.com/how-many-calories-in-a-potato/>. "Stopwatch Widget | Creativebits™." Creativebits™ | Creativity, Design and Macs. Web. 19 Nov. 2011. <http://creativebits.org/stopwatch_widget>. "Hunting Knives, Combat, Survival, Adventure, Miliatry, Bowie ..." Cuchillos, Espadas. Swiss Army Knife, Knives and Swords. Web. 19 Nov. 2011. <http://www.aceros-de- hispania.com/gb/infer.asp?ac=1>. "Christofle - Tablespoon." Christofle, L’argenterie De Luxe Et L’expression De L’art De Vivre Français. Web. 19 Nov. 2011. <http://www.christofle.com/us/101-tablespoon/1714- table-spoon-albi->.
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