In partition chromatography, separation is based primarily on the distribution of analytes between two immiscible liquids. True or False?

• A. True
• B. False
• C. Not applicable
• D. Somewhat

Answer: (A)

Partition chromatography separates compounds by their distribution between two immiscible liquid phases, which creates an equilibrium that governs retention. The analyte partitions between the mobile phase and the stationary liquid phase as the mixture moves through the column. Each compound has a different affinity for the two phases, described by a distribution (or partition) coefficient. Those with greater affinity for the stationary phase spend more time in that phase and move more slowly, while those favoring the mobile phase travel faster. Because the separation emerges from these differing partitioning behaviors, the method relies on the two liquids being immiscible and providing distinct phases for the analyte to distribute into. Therefore, the statement is true.