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The zinc granules, completely dried, flowed freely. Most granules retained their original gray color, but some had white specs on them, indicating that some zinc granuleshad oxidized. The dried (excess) zinc and beaker were left to cool to room temperature, and thenmassed. The mass of the dried zinc was determined by difference. Table 2 provides the numerical data for these calculations. Table 2: Mass of Excess Zinc GranulesMass of 30 mL Beaker: 22.146 gMass (g)Beaker+ and excessZinc 23.350Excess Zinc1.204Part II: Isolation of Zinc iodide The Zinc iodide solution, in a 30 mL beaker with a boiling stone, was then heated on a hot plate gently for about twenty minutes to evaporate the solvent (water).
The Zinc iodide solution, previously yellow, became clearer as water evaporated. Clear liquid droplets are present at the top of the beaker, with crystallized solids adhering to the bottom and the sides of the beaker. The solids are mostly white with a light yellow appearance. The yellow appearance indicates that some of the zinc solids had decomposed. The beaker with the dried zinc iodide reaction product was then left to cool to room temperature in a desiccator for about ten minutes. After ten minutes, the mass of the product, beaker, and boiling stone were determined. The mass of the zinc iodide reaction product was then calculated by difference. The final mass of zinc iodide is provided in Table 3: Table 3: Total Mass of Zinc Iodide Mass of 200 mL beaker and boiling stone: 77.026gMaterialMass (g)Beaker+Stone and Zinc Iodide Product 80.579Zinc Iodide Product3.553 Evaluation of the Law of Mass Conversation: Since most (95.829%) of the zinc and iodine reactants were conserved after