Mystery chemicals dissolved in the water are carried along in the mobile phase but drop out at different points along the way. The solvent is the mobile phase because it is moving, and the paper is the stationary phase. In paper chromatography, for example, a solvent (the liquid) moves from one end of a piece of paper to the other end, as the paper absorbs it. One of the phases is moving, the mobile phase, and the other is not, the stationary phase. All types of chromatography employ two different immiscible (non-mixing) phases in contact with each other. Chromatography is a technique used widely in chemistry and in the biological sciences for: 1) separating mixtures of compounds, and 2) to identify unknown substances. This lab will help you understand what you've read about the properties of molecules including acidic and basic molecules, polar and non-polar molecules.
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