Chem lab 1 - Experiment 1 Determination of Chemical...

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Experiment 1: Determination of Chemical Formulae Sara Korniewicz Lab Partner: Jenn King Due Date: 9/16/16
Abstract The purpose of the experiment is to evaluate the Law of Conservation of Mass and the Law of Constant Composition. An initial mass of zinc metal (2.007g) and an initial mass of iodine crystals (1.017g) were reacted to form zinc iodide with a final mass of 1.253g. The total mass of the reactants was 1.311g. This is roughly equal to the mass of the total products (with a negligible error of 4.42%), demonstrating the Law of Conservation of Mass. The Law of Constant Composition was then utilized to obtain an empirical formula of ZnI 2 . Electrolysis was then used to return the product back to its original reactants. Results Relevant measurements of reactants and products are displayed in Figure 1 below. Figure 1: Masses of Reactants and Products The final mass of the zinc iodide was 1.253g. In order for the Law of Mass Conservation to hold true, the mass of the reactants consumed should be equivalent to the final mass of zinc iodide. Amount of zinc consumed = 0.294g Since all of the iodine reacted, amount of iodine consumed = 1.017g It follows that the total mass of reactants consumed is 0.294g + 1.017g = 1.311g.

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