College Level Classic General Chemistry Lab Kit: Determining the Stoichiometry of Chemical Reactions is an engaging activity where you learn methods of continuous variation to determine the mole ratios and predict chemical formulas.
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College Level Classic General Chemistry Experiment
Students learn the method of continuous variation to determine the mole ratio of the reactants and predict the chemical formula of the product for specific chemical reactions. In Part 1, the students mix known amounts of iron(III) nitrate and sodium hydroxide in a series of reactions to form a precipitate of iron(III) hydroxide. Each reaction contains a different mole ratio of reactants. The volume of precipitate formed is then graphed versus mole ratio of reactants. The students extrapolate the data to determine the optimum ratio of reactants and predict the correct formula of the precipitated product. The experiment is repeated in Part 2 for copper(II) chloride and sodium phosphate. Students receive a visible reinforcement of the law of multiple proportions.
Complete for 24 students working in pairs.