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The Boiling Point of Sodium Chloride

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Sodium chloride is an important chemical in many processes. It is widely used in the manufacture of salt, as well as in other chemicals and industrial processes. Moreover, it is used in the making of saltpetre, as well as for pharmaceutical uses and biomedical research.

The boiling point of a compound depends on its concentration, so that the temperature at which the solution boils varies as the solute is added. The amount of a solute dissolved in the solvent is called the molal concentration, and the boiling point is calculated by multiplying this molal concentration times a constant.

So, for a 0.5 molal concentration of a solute in water (which is 58 grams of a solute dissolved per kilogram of water), the boiling point increases by about 0.5 degrees Celsius.

A soluble solute raises the boiling point of its solvent by increasing the energy required to move the molecules from the liquid phase to the vapor phase. The energy needed to do this is determined by the ionic nature of the solute.

This ionic nature means that the solute has a strong bond between the ions, which alters the intermolecular forces of the water molecules. The ions have positive charges on their oxygen side and negative charges on their hydrogen side. This causes the ions to align with each other, and the water molecules must overcome this attraction in order to move from the liquid phase into the vapor phase.