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9.3 Electrolytes

Electrolytes are chemical compounds which conduct electricity either in the fused or in an aqueous solution state and which undergo chemical decomposition due to flow of current through it.


Acid solutions - HCl, HNO3

Alkaline solutions - KOH, NaOH

Ionic salt solutions - PbBr2 , CuSO4


Strong Electrolytes

Weak Electrolytes

Allows a large amount of

Allows a small amount of

electricity to flow through

electricity to flow through



Are completely dissociated

Are partly dissociated

Solutions contain only free mobile ions

Partly ionised and partly unionised molecules are present




Acids - HCl, HNO3

Acids - Acetic, Oxalic

Bases - NaOH, KOH solution

Bases - NH4OH

Salts - CuCl2 , PbBr2

Salts - Na2CO3 , NaHCO3

Electrodes allow the electric current to enter or leave the electrolytic solution and are

two in number. They are connected to a battery and can be classified as :



connected to the positive terminal of the battery

connected to the negative terminal of the battery

Acquires positive charge during electrolysis

Acquires negative charge during electrolysis

Migration point for anions

Migration point for cations



9.1 Introduction
9.2 Electrolytic Cell
9.3 Electrolytes
9.4 Faraday's Law of Electrolysis
9.5 Electrochemical Cell
9.6 Electrode Potential

Chapter 10

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