The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in
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Use distilled water in a wash bottle to rinse off any remaining copper from the nails before removing them completely from the beaker. If necessary, use a stirring rod to scrape any excess copper from the nails. Set the nails aside to dry on a paper towel. 7. After the nails are completely dry, find the mass of the nails and record it on the Report Sheet. 8. Decant means to pour off only the liquid from a container that is holding both solid and liquid. Carefully decant the liquid from the solid. Pour the liquid into another beaker so that in case you over pour, you can still recover the solid. 9. After decanting, rinse the solid again with about 25 mL of distilled water. Decant again. Repeat this step three or four times. 10. Next, wash the solid with about 25 mL of 1M hydrochloric acid. Decant again; then, once more, clean the solid with 25 mL of distilled water. 11. After the final washing with water, place the copper in a drying oven to dry. 12. Allow the copper to become completely dry, then find the mass of the beaker plus the copper and record it on the Report Sheet. 13. Clean up all of your materials. Before you leave the laboratory, wash your hands thoroughly with soap and water; use a fingernail brush to clean under your fingernails.
PRELAB QUESTIONS 1. How many moles are present in a sample of 34.0 g of iron metal? 0.61 g/mol 2. How many atoms of iron are present in 2 mol of iron? 112 g