Question 1
Using the following standard reduction potentials
| Fe3+(aq) + e- → Fe2+(aq) | E° = +0.77 V |
| Pb2+(aq) + 2 e- → Pb(s) | E° = -0.13 V |
calculate the standard cell potential for the galvanic cell reaction given below, and determine whether or not this reaction is spontaneous under standard conditions.
Pb
2+(
aq) + 2 Fe
2+(
aq) → 2 Fe
3+(
aq) + Pb(
s)
◦
E° = +0.90 V, spontaneous
◦
E° = -0.90 V, nonspontaneous
◦
E° = -0.90 V, spontaneous
◦
E° = +0.90 V, nonspontaneous
Question 2
| Given: | Ag+(aq) + e- → Ag(s) | E° = +0.799 V |
| AgI(s) + e- → Ag(s) + I-(aq) | E° = -0.152 V |
| Ni2+(aq) + 2 e- → Ni(s) | E° = -0.267 V |
Which of the following reactions should be spontaneous under standard conditions?
| I. | 2 AgI(s) + Ni(s) → 2 Ag(s) + 2 I-(aq) + Ni2+(aq) |
| II. | Ag+(aq) + I-(aq) → AgI(s) |
◦ I and II are both spontaneous.
◦ I and II are both nonspontaneous.
◦ I is nonspontaneous and II is spontaneous.
◦ I is spontaneous and II is nonspontaneous.
