Displacement Reactions |
Some Standard Reduction Potentials |
|
Oxidants |
|
Reductants |
E0
(volts) |
|
Weakest
Oxidant |
K++e |
 |
K(s) |
-2.94 |
Strongest
Reductant |
| ↓ |
Ba2++2e |
|
Ba(s) |
-2.91 |
↑ |
| ↓ |
Ca2++2e |
|
Ca(s) |
-2.87 |
↑ |
| ↓ |
Na++e |
|
Na(s) |
-2.71 |
↑ |
| ↓ |
Mg2++2e |
|
Mg(s) |
-2.36 |
↑ |
| ↓ |
Al3++3e |
|
Al(s) |
-1.68 |
↑ |
| ↓ |
Mn2++2e |
|
Mn(s) |
-1.18 |
↑ |
| ↓ |
Zn2++2e |
|
Zn(s) |
-0.76 |
↑ |
| ↓ |
Fe2++2e |
|
Fe(s) |
-0.44 |
↑ |
| ↓ |
Ni2++2e |
|
Ni(s) |
-0.24 |
↑ |
| ↓ |
Sn2++2e |
|
Sn(s) |
-0.14 |
↑ |
| ↓ |
Pb2++2e |
|
Pb(s) |
-0.13 |
↑ |
| ↓ |
Cu2++2e |
|
Cu(s) |
0.34 |
↑ |
Strongest
Oxidant |
Ag++e |
|
Ag(s) |
0.80 |
Weakest
Reductant |
|
|
|
|
|
|
|
Key Concepts
A more active metal will displace a less active metal from solution.
- A more active metal
(i) loses electrons more easily
(ii) is the stronger reductant
(iii) is the weaker oxidant
(iv) has a lower standard reduction potential
- The less active metal
(i) is less likely lose electrons
(ii) is the weaker reductant
(iii) is the stronger oxidant
(iv) has a higher standard reduction potential
An activity series places metals in order from most active to least active.
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Examples of Displacement Reactions
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