LabReport3.pdf - Using Stoichiometry and Continuous Variation to Determine the Ratio of Products in a Chemical Reaction By Brandon Carter Partner

LabReport3.pdf - Using Stoichiometry and Continuous...

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Using Stoichiometry and Continuous Variation to Determine the Ratio of Products in a Chemical Reaction By Brandon Carter Partner: Angeline Chen Introduction Purpose Statement The purpose of this lab is to determine the optimum mole ratio of a precipitate formed by two different chemical reactions: (1). Fe(NO3)3+ NaOH (2). CuCl2+ Na3PO4. Background The stoichiometry of a chemical reaction helps to determine a quantitative answer for the amount of substance for each component involved in a chemical reaction. The chemical equations must be balanced to be able to maintain the law of conservation of mass, which ensures the mass and energy of the compounds remain constant throughout the reaction. Using the method of continuous variation, the total number of moles for each reactant is kept constant for a set of measurements that have varying mole ratios. This will allow you to see the optimum ratio, which is the stoichiometric ratio of the chemical equation. This method is very useful in this lab, as it allows you determine the mole ratio of two reactants. Since the optimum ratio will contain the greatest amount of the reactants, it will also generate the greatest amount of the products, which is equivalent to the stoichiometric ratio. Fe(NO3)3+ NaOH → products CuCl2+ Na3PO4→ products Procedures Part 1: Reaction of Iron (III) Nitrate with Sodium Hydroxide The Iron in Iron (III) nitrate acts as a lewis acid in solution. When combined with sodium hydroxide precipitate formed remains insoluble as long as Fe (III) nitrate is not in excess of stoichiometric mole ratio. When iron (III) nitrate is in excess, the precipitate will begin to dissolve. The largest the excess, the greater the amount of precipitate that dissolves. Your plot of the data will reflect this. 1.Label the seven different 100 mL graduated cylinders, 1 to 7
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2.Using a clean 50 mL, graduated cylinder, add the appropriate volume of Fe (III) NO3-1solution to all seven 100 mL graduated cylinders, as shown in
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