Question

experimental set-up showing that Ionic compounds are conductors of electricity when molten or in solution and insulators when solid.

Answer 1

Answer:

Ionic 'solids' are insulators because of the absence of free ions that are needed for the flow of electricity through them. Pure ionic solids are an aggregate of positively and negatively charged ions help by strong electrostatic forces in a rigid crystal lattice. The lattice enthalpy is quite high for ionic solids and a large amount of energy is needed to break them into free ions.

However, if ionic compounds are dissolved in a polar solvent, which has a tearing effect on the lattice, the ions become free and the solution starts conducting. Likewise, if we melt an ionic solid, i.e., change it into its fused form, it'll conduct electricity because of the presence of free ions.

So, ionic solids are insulators.

Answer 2

Answer:

Electrolysis

Explanation:

Take molten NaCl in a beaker with two metallic electrodes (Cathode amd anode) connect the electrodes to a battery(source of electricity) through a connecting wire .

Connect a bulb in the circuit between the positive terminal and anode.

The lighting of the bulb on switching on the electricity indicates:

Ionic compond(NaCl is a conductor of electricity).

Ionic compounds ionize when dissolved in water or in molten state.So they do not conduct electricity being solids due to absence of mobile ions.

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