Custom Search 3.7 Separations of solutions and mixtures chromatography Solutions, also sometimes called homogeneous mixtures, can be solids, liquids, or gases. In a solution, the macroscopic properties do not vary throughout the sample. In a heterogeneous mixture, the macroscopic properties depend on location in the mixture. Solution composition can be expressed in a variety of ways; molarity is the most common method used in the laboratory. M = nsolute /Lsolution
Chromatography- Retention Value-A particular compound will travel the same distance along the stationary phase by a specific solvent (or solvent mixture) given that other experimental conditions are kept constant. (The solute and solvent front will be proportional, no matter what size paper you use)
Unknowns can be matched up to known compounds by their Rf value.
|