Using Molecules Through A Semipermeable Membrane ( College Entrance Examination Board, 2003 ) Essay

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George Shi Osmosis Lab Report

Abstract:

The purpose of this lab was to measure diffusion of molecules through a semipermeable membrane (College Entrance Examination Board, 2003). The bags, emerged in distilled water, with different moles of sucrose mixed with water were measured by mass to see how much they had changed. The water left in different amounts, during the thirty minutes the experiment was conducted, out of the pores depending on the molarity of the sucrose inside the bags. The bags with the lower concentrations of particles than its environment lost mass while the bags with equal concentrations of particles stayed the same and the bags with higher concentrations of particles had increased mass. Introduction:

Due to their constant motion, molecules have thermal energy and one results of this motion is osmosis (Reece, Urry, Cain, Wassermann, Minorsky, and Jackson, 130). Osmosis occurs when particles move through a selectively permeable membrane will not stop until the system it is in reaches dynamic equilibrium, which is when the concentration of particles is equal throughout and there is no net movement between the areas (Karp, 2013). In this experiment, the process of osmosis was observed when different amounts of the same solute was placed in an environment of distilled water. If the two solutions have the same solute concentration, the solutions are isotonic and no osmosis will occur (Karp, 2013). If the solutions differ in concentration, the area

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