Module 3c: Electro-analytical methods

concerned with the interplay between electricity & chemistry, electrical quantities like current, potential or charge and chemical parameters such as concentration

Advantages of electroanalytical methods over other analytical methods include:

The relationship of Electrical potential to resitamce amd current

Term for the relationship E = RI

5 types of electroanalytical techniques

cathode or anode: deonoted by a positive sign

cathode or anode: electrons are liberated here

cathode or anode: oxidation reaction occurs here

cathode or anode: electrons are consumed here

cathode or anode: denoted by a negative sign

cathode or anode: reduction reaction occurs here

cathode or anode: electrons move out

cathode or anode: electrons move in

Electrochemical Cells are made up of

The tendency of an electrode which is in contact with an electrolyte to lose or gain electrons

The standard or reference electrode used to measure electrode potentials

Cells in which the reactions are irreversible in nature, and made up of use-and-throw galavanic cells

Here, the reactants are consumed for the generation of electrical energy and the cell stops producing an electric current once the reactants are completely depleted

Electrochemical cells in which the cell has a reversible reaction, i.e. the cell can function as a Galvanic cell as well as an Electrolytic cell.

Secondary cells are also known as

Two primary types of electrochemical cells

Galvanic or Electrolytic cell: chemical energy –> electrical energy

Galavanic or Electrolytic cell: electrical energy –> chemical energy

Galvanic or Electrolytic cell: spontaneous redox reactions