Ionic compounds are held together by many strong electrostatic forces between the oppositely charged ions. A lot of energy is needed to overcome these ionic bonds, so ionic compounds have high melting points.
|Ionic compound||Melting point|
A substance can conduct electricity if:
Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
Not all ionic substances are soluble and some are more soluble than others.
Although a water molecule is neutral overall, it has a weak positive charge near its hydrogen atoms, and a weak negative charge near its oxygen atom. Water molecules surround the ions in solution because they are attracted by the charges of the ions.