This project was preformed to supply Libretext Authors with videos on General Chemistry topics which can be used to enhance their projects. Also, these videos are meant to act as a learning resource for all General Chemistry students . Video Topics The methods for calculating the vapor pressure of a solution are dependent on the characteristics of the solute. A nonionic-nonvolatile solute will cause the vapor pressure of the solvent to decrease. Because the solute is nonvolatile it will not create a vapor pressure of its own. Examples are: sugar, caffeine, fats, and proteins. An ionic-nonvolatile solute will also cause the vapor pressure of the solvent to decrease. Because the solute is nonvolatile it will not create a vapor pressure of its own. However, we will need to adjust our calculations to account for the Van’t Hoff factor of the solute (i). Examples are salts such as NaCl or NaOH. A nonionic-volatile solute will also cause the vapor pressure of the solvent to decrease. However, because the solute is volatile it will also have a vapor pressure. To find the overall vapor pressure of the solution the vapor pressure of the solute and the solvent must be combined. These calculations will all involve Raoult’s Law. Raoult's Law Pa = XaPao Pa = Vapor pressure of solution Xa = Mol fraction of the solvent Pao= Vapor pressure of the pure solvent Raoult’s Law says that the vapor pressure of a solvent tends to decrease when it is part of a solution. Pa less than Pao. Link to Video Introduction to the Vapor Pressure of a Solution (Raoult’s Law): https://youtu.be/ YZ5vTzUe0yg Attribution Prof. Steven Farmer ( Sonoma State University )