Name:

Section:

1. This experiment.
2. About copper in your text.
3. About "Using an Aspirator Trap" and "Suction Filtration", under Laboratory Techniques.

Define the following terms:

• oxidation
• reduction
• acid
• base
• precipitation reaction
• limiting reagent
• percent yield

1. For reaction of Cu with nitric acid, the nitric acid is first diluted. What is the new molarity of the nitric acid used? Concentrated nitric acid is 15.9 M.
2. Suggest reasons why the solution obtained by reacting copper with HNO₃ in Part 1 is treated with aqueous NaHCO₃ ("aqueous" means dissolved in water) in part 2. Can you suggest a substitute for NaHCO₃?
3. 0.4220 g of copper is dissolved in concentrated nitric acid. The resulting solution is neutralized with NaOH, and excess NaOH is added, resulting in a blue solid. The solid is isolated by filtration and thoroughly dried. It is then weighed at 0.5420 g. Speculate on the identity of the blue solid; i.e., give its formula. Based on your formula, calculate the %yield of this blue product.