lab 2 - Synthesis of Zinc Iodide Author: Amber Bellafiore...

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Synthesis of Zinc Iodide Author: Amber Bellafiore Lab Partner: Tracey Beyer Instructor: Zhen Li Chem. 104A Section17 Date Work Preformed: 9/7/07 Date Report Submitted: 9/10/07
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Introduction: The law of constant composition states that chemical compounds always contain the same weight ratios as their component elements. In this experiment, the combination of zinc and iodine to form zinc iodide confirms the law of constant composition. To accomplish this, zinc and iodine we mixed together with distilled water and acetic acid which forms a reaction. The reaction will turn a reddish-brown and emit heat, when the color changes to clear and the test tube is back to room temperature, then the reaction is complete. With the new reaction mixture, a gravity filtration to filter the unreacted zinc is used. Excess zinc is used instead of iodine because excess zinc can easily be filtered out, however with iodine it would remain dissolved in the solution. Dehydrate the zinc iodide solution until crystals form, then when no water is left, weigh both the zinc iodide
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lab 2 - Synthesis of Zinc Iodide Author: Amber Bellafiore...

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