In order for a substance to be an effective mobile phase in a chromatography experiment, it must be able to move different components of a mixture at different rates.
Chromatography involves the separation of substances using the application of the solubility differences in them. It has two phases known as the stationary and mobile phases.
The mobile phase involves motion which is why the ability of substances to move at different rates is a great factor in this type of phase. The Stationary phase on the other hand doesn't involve movement of substances.
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