What happens to water when calcium chloride is added to water?

Answer 1

The calcium chloride will completely dissociate when it enters the water, resulting in calcium and chloride ions floating throughout the water. The hydrogen bonds between the individual water molecules will become disrupted, resulting in a dipole-ion force between either the hydrogen dipole and the chloride ion or the oxygen dipole and the calcium ion.

Because a dipole-ion intermolecular force is stronger than a hydrogen bond force, the solution will require more heat energy to be added to liberate the water molecules from the solution and cause a phase change from liquid to gas. The same is true for freezing - because the dipole-ion intermolecular forces are stronger, the typical hydrogen bonds that would form and create a stable lattice structure cannot form as easily and you have to remove a greater proportion of heat energy from the solution to cause a phase change from liquid to solid.

Answer 2

When calcium chloride is added to water, it dissolves and dissociates into calcium (Ca2+) and chloride (Cl-) ions. This process releases heat, making the solution warmer. Calcium chloride is hygroscopic, meaning it can absorb moisture from the air, making the solution even more concentrated over time.