The ionic bonding in sodium chloride requires strong electrostatic forces of attraction between the sodium (Na+) and chlorine (Cl-) ions. This is why it takes a lot more energy to melt sodium chloride than to melt water.

In solution, the ions separate into solvent separated ion pairs, and the attraction between them weakens considerably. As a result, the pH of a sodium chloride solution is 7. It is soluble in only highly polar solvents such as water.

When sodium and chlorine ions recombine in the molten state, they form solid salt. This process, known as decomposition, also requires a lot of energy. This energy is released as heat, so the melting and boiling points of ionic compounds are very high.

The melting point of solid sodium chloride is 2575 °F (1413 °C). Boiling it produces the same results: the atoms separate into sodium and chlorine ions, which then recombine in the vapor phase.

Sodium Chloride Side Effects

Using this medication may cause nausea and vomiting, stomach pain, headache, and fluid retention in your legs or feet. These effects can be lessened if you drink lots of fluids while taking this medication. If these symptoms do not go away, talk to your doctor.