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Strong electrolytes:

Compounds which in their aqueous solution or in the fused state are almost completely ionised are called strong electrolytes.

Examples: Mineral acids, alkalis and salts

Compounds which in their fused state or aqueous solution are feebly ionised and are poor conductors of electricity are called weak electrolytes.

Examples: Acetic acid, oxalic acid

• Nature of solute: Strong electrolytes have degree of dissociation near 1 and weak electrolytes have degree of dissociation less than 1.
• Nature of solvent: Solvent with high dielectric constant shows higher degree of dissociation.
• Dilution: Degree of dissociation increases with dilution of solution.
• Temperature: Degree of dissociation increases with an increase in temperature.
• Addition of other species: Addition of another solute having an ion common to that of a weak electrolyte shows a decrease in the degree of dissociation of the weak electrolyte.