Copper+Reaction+Cycle

Each lab group in the 10th grade was given a piece of copper metal. The metal was dissolved in nitric acid and then turned into a number of ionic compounds before being retrieved as metal again.

This table contains the initial mass and final mass of each group's copper sample. There is also a link to each group's web log of the experiment. of Copper (g) || Final Mass of Copper (g) || Percent Yield (%) || Link to weblog. || The procedures for each reaction are listed in this table.
 * Group || Initial Mass
 * Joanna and Soo Ah || 0.502 || 0.445 || 88% || Diary ||
 * Andy&Maurice and Shaun || 0.4 || 0.355 || 84% || Click here to see our photos ||
 * Stephen and Iikka || 0.570 || 0.433 || 75% || Click here ||
 * Maaike and David || 0.547 || 0.481 || 87.93 || See our lab journal here! ||

Do not forget to photograph and analyze the salts you prepared by evaporating the filtrate after reactions 3 and 5.
 * Reaction 1 || Dissolve copper in Nitric Acid || Place the piece of copper in a small beaker. Pour 10 mL of concentrated nitric acid onto the copper. Do this reaction in the fume hood so that the nitrogen dioxide and acid fumes are removed. ||
 * Reaction 2 || Precipitate copper (II) hydroxide || To the mixture from reaction 1, add 10 mL 8M NaOH solution. Use a dropper pipette to add the solution slowly while stirring with a stirring rod. This step can be done on the lab table, but goggles must be worn. ||
 * Reaction 3 || Make copper (II) oxide || Slowly add drinking water to the mixture from reaction 2 until the total solution volume is roughly 100 mL. Gently heat the solution with continued stirring until the color change is complete. Decant the solution several times to rinse the precipitate. Pour some of the filtrate in a labeled petri dish and allow the water to evaporate. ||
 * Reaction 4 || Make copper (II) chloride || Your beaker should contain a black precipitate with some water in it. Obtain about 10 mL of 3M hydrochloric acid in a small beaker. Pour it slowly into the beaker containing the black precipitate. Stir while pouring and observe the changes. ||
 * Reaction 5 || Precipitate copper (II) phosphate || Obtain 20 mL of 0.5M sodium phosphate solution. Add it to the beaker and observe changes. Heat the mixture to make it warm. This allows the precipitate to clump together. Filter the contents of the beaker and collect the filtrate. Pour some of the filtrate into a labeled petri dish and allow the water to evaporate. ||
 * Reaction 6 || Make copper (II) sulfate solution || # Rinse the beaker containing the filtrate from the last step.
 * 1) In a second beaker, obtain 50 mL of 0.4 M sulfuric acid.
 * 2) Pour the acid onto the precipitate and observe the change.
 * 3) If solid remains in the filter paper, pour the filtrate back into the funnel. Repeat this step until the filter paper is free of all precipitate.
 * 4) Rinse the filter paper one last time with 20 mL of hot water. Collect all of the filtrate in one beaker.
 * 5) Discard the filter paper. Rinse the funnel and glassware. Dry them on the rack. Replace clamps, wire gauzes, burners and ring stands to the proper storage places. Wipe the table with a wet sponge.
 * 6) IF the salt water you collected after step 5 is dry, take a picture of it and update your wiki journal. ||