NCERT Chemistry Class 12 Chapter 2: Electrochemistry

Electrochemistry is an important chapter in Class 12 Chemistry that deals with the relationship between chemical reactions and electrical energy. It explains how chemical energy can be converted into electrical energy and vice versa. The concepts of electrochemistry are widely used in batteries, fuel cells, corrosion prevention, and industrial processes.

What is Electrochemistry?

Electrochemistry is the branch of chemistry that studies the production of electricity from chemical reactions and the use of electrical energy to drive chemical changes.

Electrochemical Cells

An electrochemical cell is a device that converts chemical energy into electrical energy through redox reactions. It consists of two electrodes and an electrolyte solution. The two main types of electrochemical cells are galvanic cells and electrolytic cells.

Electrode Potential

Electrode potential is the tendency of an electrode to lose or gain electrons. It plays a crucial role in determining the direction of electron flow and the overall cell potential.

Nernst Equation

The Nernst Equation is used to calculate the electrode potential of a cell under non-standard conditions. It helps in understanding the effect of concentration and temperature on cell potential.

Conductance of Electrolytic Solutions

Conductance refers to the ability of an electrolyte solution to conduct electricity. It depends on the number of ions present in the solution and their mobility.

Factors Affecting Conductance

• Nature of electrolyte
• Concentration of solution
• Temperature
• Mobility of ions

Electrolysis

Electrolysis is the process in which electrical energy is used to carry out a non-spontaneous chemical reaction. It is widely used in metal extraction, electroplating, and purification of metals.

Batteries and Fuel Cells

Batteries are devices that store chemical energy and convert it into electrical energy when required. Fuel cells are advanced electrochemical devices that generate electricity continuously through chemical reactions.

Corrosion

Corrosion is an electrochemical process that causes the gradual deterioration of metals. Understanding electrochemistry helps in developing methods to prevent corrosion and increase the lifespan of metal structures.

Importance of Electrochemistry

Electrochemistry has applications in energy storage, industrial manufacturing, electroplating, corrosion control, and environmental protection. It forms the basis of many modern technologies used in daily life.