Boiling-point elevation Bonding

Bohr theory (4.2) The first theory of the atom to propose that electrons in atoms were in definite energy levels, boiling point (14.2) The temperature at which a liquid changes to a gas at the prevailing pressure, boiling-point elevation (15.6) An increase in the boiling point of a solvent due to the presence of a solute, bond See covalent bond and ionic bond. bond order See total bond order. 

Boiling-Point Elevation and Freezing-Point Depression Constants Bond Enthalpies... 

You cannot apply the boiling point elevation equation to volatile solutes. As shown in Chemistry Lecture 4, a volatile solute can actually decrease the boiling point by increasing the vapor pressure. If you know the heat of solution, you can make qualitative predictions about the boiling point change when a volatile solute is added. For instance, since you know that an endothermic heat of solution indicates weaker bonds, which lead to higher vapor pressure, you can predict that the boiling point will go down. 

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