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If you live in a colder climate, you might have seen trucks spreading salt on the road when snow or ice is predicted. This is done because salt has a lower freezing point than water. In addition, table salt will bind with the water molecules and prevent them from moving into the gas phase. This is because the ions will attract and form stronger molecular interactions.
As a result of these stronger molecular interactions, the dissolved salt particles will have higher boiling and melting points than the molecules of the solvent. This is known as the colligative property of the solution and is based on the Raoult’s Law of boiling and condensation.
The melting point of NaBr is 755degC, and the boiling point is 1396degC. When a solution of NaBr is heated, it will boil and produce sodium chloride and bromine gas. This is because NaBr is an ionic compound that is held together by ionic bonds while HF is a covalent compound and holds itself together with bonding between electrons.
The ranking of these compounds in order of their boiling point elevation will depend on two factors: the vapor pressure elevation constant of the solvent, and the van’t Hoff factor of the solute. If molality is held constant, the compound with the highest van’t Hoff factor will yield the greatest boiling point elevation. This is because ions will be produced in the solution and the number of ions will increase with increasing concentration.