Question 1
Suppose the reaction Pb(s) + 2H
+(aq) → Pb
2+(aq) + H
2(g) is carried out at pH = 4.00 and at a hydrogen gas pressure of 1.00 atm. The concentration of lead(II) ions that causes this reaction to be at equilibrium is
◦ 2.5 M
◦ 1.6 × 10
–2 M
◦ 2.5 × 10
–4 M
◦ 1.6 × 10
–6 M
◦ 0.40 M
Question 2
The half-cell reaction for the oxidation of H
2O(l) to O
2(g) is given below.
2H
2O(l) → O
2(g) + 4H
+(aq) + 4e
–Which choice lists all of the following species that can oxidize H
2O to O
2(g) under standard-state conditions?
MnO
4–(aq), Cl
2(g), Pb
2+(aq), Cl
– (aq), Ag
+(aq)
◦ Cl
–(aq) only
◦ Cl
2(g) only
◦ Pb
2+(aq) and Ag
+(aq)
◦ Cl
–(aq) and MnO
4–(aq)
◦ MnO
4–(aq) and Cl
2(g)