1. Complete and balance the following in aqueous solutin:
a. chlorite ion plus hydrobromic acid
b. calcium hydroxide plus perchloric acid
c. H3PO4(aq) + Zn(C2H3O2)2(aq)
d. Sc3+(aq) + H2O(l)
e. cyanate ion plus water
f. Na2S(aq) + Fe(NO3)2(aq)
g. chromate ion plus nitrite ion giving chromium 3+ ion and nitric acid
h. MnO4–(aq) + C2O42–(aq) → Mn(OH)2(s) + CO2(g)
2. The data given below was found for the reaction
[Cr(NH3)5(H2O)]3+(aq) + Cl–(aq) → [Cr(NH3)5Cl]2+(aq) + H2O(l)
[[Cr(NH3)5(H2O)]3+] (M) [Cl–] (M)Initial Rate (M·s–1)
0.00100.00107.0×10–3
0.00200.00101.4×10–2
0.00200.00202.8×10–2
Find the rate law and the rate constant (including units).
3. Find the pH of a 0.10 M solution of butyric acid (C3H7CO2H).
4. Find the molar solubility of PbBr2 in water.
5. Consider the reaction between Pb(OH)2(s) and HCl(g) at 25 °C.
a. Find ΔG° for the solubilization of Pb(OH)2.
b. Find ΔG° for the autoionization of water.
c. Find ΔG° for the solubilization of PbCl2.
d. Find ΔG° for the reaction of HCl(g) with water.
e. Find ΔG° for the reaction of Pb(OH)2(s) with HCl(g).
6. Consider the reaction F2(g) + H2O(l) → OF2(g) + F–(aq)
a. Find the oxidation numbers in all of the atoms in the reactants and products.
F in F2
H in H2O
O in H2O
O in OF2
F in OF2
F in F–
b. Balance the reaction under acidic conditions.
c. Find the standard potential for the reaction.
d. Find ΔG° for the reaction.
e. Is the reaction spontaneous or nonspontaneous? Why?
7. Consider the cell:
Pt(s) | PbSO4(s) | PbO2(s) | SO42–(aq) | pH = 0 || PbO2(s) | Pb2+(aq) | pH = 0 | Pt(s)
a. Write the oxidation half-reaction.
b. Write the reduction half-reaction.
c. Write the net reaction.
d. Find the standard potential at 25 °C.
e. Find the equilibrium constant for the reaction.
f. What is the appropriate label (Ka, Kb, etc.) for the equilibrium constant?