Chem 2070 Lab Report #1.docx - Determination of Chemical...

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Determination of Chemical Formulae: Reaction of Zinc and IodineAbstract This lab sought to evaluate the validity of the Law of Conservation of Mass and the Law of Constant Composition through the synthesis and decomposition of zinc iodide. A known massof iodine and zinc was used to synthesize zinc iodide by heating a zinc iodide solution in order to evaporate the water and leave a precipitate (the solid zinc iodide). The mass of this final product added to the mass of excess zinc was then compared to the mass of the original reactants of zinc and iodine. It was found that the Law of Conservation of Mass was valid because the mass of the reactants and products were equal (+0.1 grams). Furthermore, the experiment validated the Law of Constant Composition by producing a product with an empiricalformula containing a ratio of elemental masses consistent with the empirical formula commonly assigned to zinc iodide. Results and DiscussionThe Law of Conservation of Mass was said to be validated by this experiment. This law states that mass is neither created nor destroyed during a reaction, so the mass of the reactantsmust equal the mass of the products. This experiment used the reaction of the synthesis of zinc and iodine to create zinc iodide in order to validate this law. The reactants included 2.074 gramsof zinc and 3.323 grams of iodide which meant that the reactants had a sum mass of 5.397 grams. The products included the zinc iodide product which had a mass of 4.057 grams and theexcess solid zinc which had a mass of 1.192 grams meaning that the total mass of the products was 5.249 grams. There was only a difference of 0.148 grams between the reactants and the products. This difference of about 0.1 grams between reactant and product are not enough to discount the Law of Conservation of Mass and it is concluded to be upheld. This discrepancy

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