Which analytical technique separates components of a mixture based on their interactions with a stationary phase and a mobile phase?

Which analytical technique separates components of a mixture based on their interactions with a stationary phase and a mobile phase?

• A. Filtration
• B. Distillation
• C. Evaporation
• D. Chromatography

Answer: (D)

Chromatography hinges on how each component interacts with two phases: a stationary phase that stays in place and a mobile phase that flows through it. The mixture is carried by the mobile phase while the stationary phase provides different affinities for the components. Substances that stick more to the stationary phase move slowly, while those that prefer the mobile phase ride along and travel faster. This difference in affinity causes the components to separate as they move through the system, producing distinct spots or peaks. This idea is different from filtration, which separates by physical barrier and particle size; distillation, which relies on differences in boiling points; and evaporation, which mainly removes solvent rather than separating components via phase interactions.

Chromatography hinges on how each component interacts with two phases: a stationary phase that stays in place and a mobile phase that flows through it. The mixture is carried by the mobile phase while the stationary phase provides different affinities for the components. Substances that stick more to the stationary phase move slowly, while those that prefer the mobile phase ride along and travel faster. This difference in affinity causes the components to separate as they move through the system, producing distinct spots or peaks. This idea is different from filtration, which separates by physical barrier and particle size; distillation, which relies on differences in boiling points; and evaporation, which mainly removes solvent rather than separating components via phase interactions.