Sodium chloride (NaCl), also known as table salt, does not have a boiling point. Boiling point is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. Pure substances, such as water, have a specific boiling point at a given pressure. However, sodium chloride is an ionic compound that dissociates into sodium and chloride ions when dissolved in water. Therefore, a sodium chloride solution is a mixture, not a pure substance. The boiling point of a solution depends on the concentration of the solute (sodium chloride) and the solvent (water). As the concentration of sodium chloride increases, the boiling point of the solution also increases. This phenomenon is known as boiling point elevation.