1. Complete and balance the following equations.
a. ammonia plus perchloric acid
b. Cd2+(aq) + NH3(aq) {NH3 is in excess}
c. As2O3(s) + NO3–(aq) → H3AsO4(aq) + NO(g)
d. Bi(OH)3(s) + Sn(OH)3–(aq) → Bi(s) + Sn(OH)62–(aq)
2. Consider the reaction between solid barium chloride and aqueous sodium sulfate.
a. Write the balanced reaction.
b. Find ΔH° for the reaction in units of kJ.
c. Find ΔS° for the reaction in units of J/K.
d. Find ΔG° for the reaction at 25 °C in units of kJ.
e. Find ΔG° for the reaction at 75 °C in units of kJ.
f. Is the reaction spontaneous or nonspontaneous at each temperature? Why?
3. Barium carbonate has a molar solubility of 5.7×10–5 M at 25 °C and 6.1×10–5 M at 85 °C. Find Ksp at each temperature and ΔH° and ΔS° for the solubilization reaction.
4. Consider the cell: Li(s) | Li+(aq) || Fe2+(aq) | Fe(s)
a. What is the balanced oxidation half-reaction?
b. What is the balanced reduction half-reaction?
c. What is the balanced net reaction?
d. What is the standard potential for the cell?
e. Is the reaction spontaneous or nonspontaneous? Why?