CBSE Class 12 Chemistry Notes: Electrochemistry

Standard Reduction Potential

Eo Cu2+/Cu Means standard Reduction potential of copper at P = 1 atm, T = 298 K (250 C) and [M] = 1 molar.

Eo Cu/Cu2+ → SOP (Standard Oxidation Potential)
Eo Ag+/Ag → Standard Reduction Potential (Standard RP)

E Ag+/Ag → Reduction Potential (RP)

Ag+ + e- → Ag [Reduction Potential ]

Eo Zn/Zn2+ = 0.76 V Zn → Zn2+ + 2e- (SOP)

Eo Zn2+/Zn = -0.76 V Zn2+ + 2e- → Zn (SRP)

Ex.

A → A+ + e- 1.2 V A+ + e- → A

B → B+ + e- 1.0 V B+ + e- → B

C → C+ + e- 0.8 V C+ + e- → C

D → D+ + e- -0.4 V D+ + e- → D

E → E+ + e- -0.8 V E+ + e- → E

What’s the Oxidation Potential of A ? 1.2 V
What’s the Reduction Potential of C ? – 0.8 V
What’s E D/D+ ? – 0.4
What’s E B+/B ? – 1.0
Which is more metallic A or D ? A
Which is more non – metallic B or C ? C
Which can displace Hydrogen gas from H2SO4 ? A, B, C
Which undergoes easy reduction A or B ? B
Which is better oxidation agent B or C ? C
Which is better reducing agent B or E ? B
Which can displace D from it’s salt C or E ? C
What you can say about D+ + e- → D, reduction potential or oxidation potential ? Reduction potential