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The boiling point of a substance is the temperature at which it transitions from liquid to gas. It is usually significantly higher than its melting point.
Magnesium chloride (MgCl2) has a melting and boiling point of 714 degC and 1412 degC respectively. The density of anhydrous MgCl2 is 2.32 g/cm3.
MgCl2 is an ionic compound with a molecular formula of MgCl2. It has two atoms of magnesium and 2 atoms of chlorine.
This is an ionic compound that dissolves easily in polar solvents like water. However, it does not dissolve in non-polar solvents like acetone.
Its ionic radius is 2.53 Ao which is the same as that of NaCl. The ionic bond between the magnesium metal and the two chloride ions forms due to the sharing of charges and their electrons.
There are other ionic compounds that differ from MgCl2 in its ionic radius but still have similar ionic bonds. These include sodium chloride, which has a high melting and boiling point because it has a large number of ions that attract each other in water.
When a compound dissociates into its component ions in a liquid solution, it reduces the amount of intermolecular forces. The reduced force reduces the rate of the chemical reaction. This decrease in intermolecular forces inhibits the transition to a gaseous state and therefore increases the boiling point.