Experiment 3
The Stoichiometry and Reactions of Some Copper Compounds

PRELAB QUESTIONS

References:
Ebbing, "General Chemistry", 5th ed., pp. 73-76, (balancing equations), pp. 91-93 (Molecular and Ionic Equations, pp. 95-116 (Types of Chemical Reactions)

Learning Center:
SSM Lesson 2 (balancing equations), Lesson 3 (stoichiometry); answers to pre and post-lab questions

SHOW SET-UP FOR ALL PROBLEMS

1. Balance the following equations which represent reactions to be performed in this lab experiment.

	____Cu(s) + ____H+(aq) + ____NO3- ----> ____Cu2+(aq) + ____NO2(g) + ____H2O(l)
	____Cu2+(aq) + ____OH-(aq) ----> ____Cu(OH)2(s)
	____Cu(OH)2(s) ----> ____CuO(s) + ____H2O(l)
	____CuO(s) + ____H+(aq) + ____HSO4-(aq) ---> ____Cu2(aq) + ____SO42-(aq) + ____H2O(l)
	____Cu2(aq) + ____Zn(s) ----> ____Cu(s) + ____Zn2+(aq)
	____Zn(s) + ____H+(aq) ----> ____Zn2+(aq) + ____H2(g)

2. A student weighs 1.035 g Cu into a 250 mL beaker at the beginning of the experiment. At the end of the experiment 0.972 g Cu is recovered. Calculate the percent loss of Cu.