When covalent compound mix with ionic compound the conductivity does not changed.
Ionic compound when dissolve in water conduct electricity because when ionic compound dissolve in water it will dissolve into ions and ions are free to move from place to place .
Ionic solutions are known as electrolytes.
While covalent compound do not conduct electricity because it dissolve as molecule when dissolve in water and form a layer on the top of water.
for example : nacl that is sodium chloride when dissolve in water conduct electricity which is ionic compound.
And sugar which is a covalent compound when dissolve in water do not conduct electricity.
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