The goal of this lab is to develop and understanding of how the various intermolecular interactions affect the physical properties of substances and solutions. By heating separate solutions of Ethanol and Acetone, one can compare the relationship between the Hydrogen Bonds, and London-type Dispersion respectively, the strength of those bonds, and their effects upon the vapor pressure of the substance, the heat of vaporization of the substance, and the boiling point of the substance. This is done by graphing the natural log of the pressure, by inverse temperature, then from that graph, calculating the heat of vaporization via the Clausius-Clapeyron Equation:
The Clausius-Clapeyron Equation in its full form is used to show the mathematical relationship between the heat of vaporization and temperature:
The resulting differing heats of vaporization then demonstrate the weaker intermolecular interactions in Acetone, as compared to Ethanol. This is because stronger bonds require more energy to break, and thus require more energy to excite to the point of entering the gaseous state.