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Mole Ratio - Chemical Demonstration Kit

by Flinn Scientific

Item #: AP7360

Price: $25.60

The Mole Ratio - Stoichiometry Chemical Demonstration Kit promotes great critical-thinking and determining balanced equations. The method of continuous variation is presented to students for an interesting oxidation–reduction reaction.

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Product Details

How do you determine a balanced chemical equation when you only know the formulas of the reactants? In this interactive demonstration, the method of continuous variation is presented to the students for the oxidation–reduction reaction of sodium hypochlorite and sodium thiosulfate. Solutions of reactants are mixed in various volume and mole ratios, with the total number of moles of reactants held constant. The amount of heat released in the exothermic reaction is directly proportional to the amount of product formed. The maximum temperature change is produced at the optimum mole ratio of reactants. Students plot temperature versus the volume ratios to determine the mole ratio and identify the products of the overall reaction. Great critical-thinking demonstration! Includes detailed Teacher Notes and a reproducible student worksheet. Enough materials are included to perform the demonstration seven times. Concepts: Stoichiometry, mole ratio, oxidation–reduction, heat of reaction. Time Required: 20 minutes Materials Provided: Sodium hypochlorite solution, sodium thiosulfate solution, polystyrene cups. Note: Perform this demonstration in a fume hood or well-ventilated lab.