Question

why solid nacl does not conduct electricity but conducts electricity when dissolved in water?

Answer 1

See the, NaCl molecule is an ionic compound ,so,due to the strong electrostatic force between the Na(positive ion) and Cl(negative ion) as a result their is no free electrons in the compound in solid state but in liquid state(molten or aqueous),I mean when dissolved in water the water molecules break the NaCl molecules into ions due to the uneven charge distribution and in molten state when the compound is strongly heated the electrostatic force of attraction between them reduces,hence breaking it into Na+ and Cl-,that's why NaCl (solid ) is not an electrolyte

Answer 2

see solid particles has no any electron charge so they dose not conduct with electricity but water has electron charge so it conduct.......

EX:-
NaCl=Na+ + Cl- (sault)
and
H2O=H2+ + O-