Using a dropper, transfer one drop of your solution from Test tube 1 to Test tube 2. Add nine drops of water. Add 1 drop of the solution in Test tube 2 to Test tube 3, and then add nine drops of water. Continue adding one drop of solution from one test tube to the next until you have diluted down each one to one tenth of the concentration of the previous test tube. Record the color of the liquid of each of the test tubes in your table.
Ammonia is an indicator of the presence of copper ions.
Add ten drops of ammonia to each of the 5 test tubes. Record your observations in your table. Compare your results with the other team in your group and copy their completed data table. Use the data from both data tables to estimate the concentration of the unknown copper sulfate waste solution. Record your estimate.