Homework Help: pre lab Q on chromatography

Posted by Natash on Sunday, April 19, 2009 at 6:45pm.

suppose that there are two components, A and B, in a mixture. The chemical affinity of A for the stationary pahse is less than that of B and the chemical affinity of A for the mobile phase is greater than that of B. If the mixture is subjected to paper chromatography, which substance will have traveled further at the completion of the experiment? which substance will have the largest Rf value ? explain each answer.

pre lab Q on chromatography - DrBob222, Sunday, April 19, 2009 at 7:10pm
Use common sense. If the paper holds B and the mobile phase moves A, then A must travel faster than B. Look up the definition of Rf value; won't the Rf value of A be greater than the Rf value of B? Check my thinking.

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