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CBSE Class 12-science Chemistry Electrochemistry

Conductivity of Solutions

Discuss the classification of substance as conductors and insulators. Learn the definition of specific conductivity and molar conductivity.

Kohlrausch's Law

Kohlrausch's law states that at infinite dilution, each ion makes a definite contribution towards the molar conductivity of the electrolyte irrespective of the nature of the other ion with which it is associated.
Kohlrausch's law is helpful in determining the limiting molar conductivities of weak electrolytes.
At infinite dilution, the concentration approaches zero and degree of dissociation approaches unity.

Electrolysis

Understand the concept of electrolysis and Faraday's laws of electrolysis, construction and working of electrolytic cells. Numericals on Faraday's law.

Electrochemical Cells

Direct Redox reactions convert chemical energy into heat energy.
Electrochemical cell is a device which converts chemical energy into electrical energy.
The cell is represented by writing the anode on the left and cathode on the right

Standard Electrode Potential

The standard electrode potential of the electrode can be evaluated using a reference electrode called standard hydrogen electrode.
The arrangement of various elements in the order of increasing values of standard reduction potentials is called electrochemical series.
Metals at the top of the electrochemical series are good reducing agents.

Nernst Equation

Understand Nernst equation. Calculate cell potential, Equilibrium constant and Gibb's energy using Nernst equation.

Batteries

Classification of cell as primary and secondary. Construction working and application of Dry, Mercury, Fuel, Lead storage and Nickel cadmium cell.

Corrosion

Understand the meaning of corrosion. Electrochemical process, factors, prevention of corrosion, rusting of iron.

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