Solid crystals of sodium chloride do not conduct electricity but aqueous solution of sodium chloride con
Answers
There is a difference between ionic conductivity and the conductivity due to electrons. In solids, the free electrons present in conduction band usually contribute for electrical conductivity. However, the sodium chloride in its solid state do not contain free electrons in its conduction band. Consequently, sodium chloride exhibits poor electrical conductivity in solid state. In contrast, its solution in water conducts electricity through ions. The massive ions present in the solution respond to the applied fields and move accordingly, which eventually results in an ionic conductivity.
Solid Sodium chloride has their ions fixed in position in a crystal structure hence ions cannot move so solid ionic compounds cannot conduct electricity. But in molten state ions are free to flow and therefore in molten state sodium chloride can conduct electricity.
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