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The purpose of this experiment is to determine the effect of changing the concentration of a reactant upon the rate of a reaction.
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sciencee PURPOSE The purpose of this experiment is to determine the effect of changing the concentration of a reactant upon the rate of a reaction. DESCRIPTION This investigation is appropriate for a general or first-year college-prep course. The effect of changing the concentration of thiosulfate ion is studied by observing the time required for a fixed amount of product to form. As the reaction proceeds, the solution becomes cloudy due to the formation of a colloidally dispersed precipitate of sulfur. In order to determine the point at which a specific amount of product has formed, an "x" is observed through the solution. The reaction is timed until the "x"" is no longer visible. TIME REQUIRED 40 to 50 minutes. MATERIALS Chemicals: 0.15 M sodium thiosulfate solution (23.7 g Na2S2O3 dissolved in deionized or distilled water to make one liter of solution)* 6 M HCl solution (dilute 500 mL concentrated HCl solution to one liter with...
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