Important Formulae XII Physical Chemistry - Electrochemistry

Class XII Chemistry Ch:3 Chapter: Electrochemistry Important Formulae & Concepts

1.

Eө

2.

E = Eө -

3.

4.

cell

= Eө

cathode

– Eө anode

0.059 1 log n+ (At 298 K) n [M ] 2.303RT [Anode ion] Ecell = Eөcell log nF [Cathode ion] 0.059 Eөcell = log K c (At 298 K) n

5.

∆Gө = -nFEөcell

6.

R=ρ

7.

Conductance:G =

8.

Conductivity = Conductance × Cell constant

9.

1 1 l l κ = = ( ) =G ρ R A A

l 1 l = A κ A 1 R

10. Cell constant and is denoted by the symbol G*

Specific conductance = Molarity κ x 1000 = C

11.

Λm =

12.

Λm

κ C

Remember: Unit of Λm in above formula is Scm2mol-1 ∧c 13. α = m 0 ∧m 14. K a =

c α2 1-α

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15. Kohlrausch’s Law of independent migration of ions: If the limiting molar conductivity of the cations is denoted by λo+ and that of the anions by λo− then the limiting molar conductivity of electrolyte is: 0 ∧m = ν + λ0+ + v − λ0−

Where v+ and v- are the number of cations and anions per formula of electrolyte. 16. Faraday constant: It is equal to 96487 C mol-1 or approximately equal to 96500 C mol-1.

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