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Unformatted text preview: Lauren Taranow lmt827 9-27-11 Unique: 51070 Discussion - Experiment 3: Determination of a Chemical Formula This experiment demonstrates the law of definite proportions by determining unknown amounts of chemicals in a chemical compound. After the moles of each substance in the sample are determined, that amount can be multiplied proportionally to determine the mole ratio of the compound. This ratio can be used to write the empirical formula and name the hydrated ionic compound. A 1.0037-gram sample of copper chloride hydrate was first heated to evaporate any water in the compound. During the dehydration process, the substance changed color from a bright teal to dark brown, showing the process caused a physical change. Dehydrating the sample also caused a chemical change in the compound because it changed the makeup of the hydrated ionic compound by removing the water. The mass of the dehydrated substance was 0.8125 grams, showing the amount of water in the substance was equal to 0.1912 grams. Water then had to be added to the heated sample to form a solution, necessary for the oxidation-reduction reaction to occur between the aluminum wire and copper. When ~16 ml oxidation-reduction reaction to occur between the aluminum wire and copper....
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