Sodium chloride (NaCl) is a crystalline compound that exists as a solid at room temperature. At 100 degrees Celsius, it will remain in its solid state unless dissolved in a solvent, such as water. The melting point of sodium chloride is approximately 801 degrees Celsius, so it will not melt at 100 degrees Celsius. When sodium chloride is dissolved in water, it dissociates into sodium (Na+) and chloride (Cl-) ions, which are free to move around in solution. This process is known as ionization.