Properties of Ionic Compounds
(i) Ionic Compounds are solids, e.g., NaCl, KCl,CuSO4 ,NaNO3 are solids.
(ii) Ionic Compounds are somewhat hard and brittle. It is due to strong force of attraction between them.
(iii) Ionic Compounds have closed packed structures, e.g., NaCl has face centred cubic structure.
(iv) Ionic compounds have high melting and boiling points. It is because of strong face of attraction between oppositely charged ions. therefore , high energy is required to break the metallic bonds between ions.
(v) Ionic or electrovalent compounds are soluble in water because they form ions in aqueous solution.
(vi) Ionic compounds are insoluble in organic solvants like alcohol, acetone. ether , chloroform, carbon disulphide etc. because they do not form ions in organic solvents.
(vii) Ionic compound conduct electricity in molten state and in aqueous solution of ions carry current. The movement of ions take place towards oppositely charged electrode in electric field.
(viii) They do not conduct electricity in solid state because ions are not free to move.
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