Which method is commonly used to separate components of a homogeneous mixture?

Which method is commonly used to separate components of a homogeneous mixture?

• A. Filtration
• B. Centrifugation
• C. Chromatography
• D. Decanting

Answer: (C)

Separating components of a homogeneous mixture relies on differences in how each component interacts with a stationary phase versus the moving solvent. In a true solution, there aren’t any distinct particles to trap or layers to separate, so methods that rely on size, sedimentation, or immiscible layers aren’t suitable. Filtration depends on particle size to remove solids from a liquid, so it can’t separate dissolved species. Centrifugation separates by density in a mixture with two phases or suspensions, and a uniform solution doesn’t form separate layers to spin apart. Decanting works when there are immiscible liquids or a settled phase, but a homogeneous solution is a single phase with all components dissolved, so decanting won’t split it. Chromatography, on the other hand, separates components based on how each one partitions between a stationary phase and a mobile phase. Different components interact differently with the stationary phase, and with the solvent as it moves through, so they travel at different speeds and end up separated along the path. This makes chromatography the common method for separating components within a single-phase mixture.

Separating components of a homogeneous mixture relies on differences in how each component interacts with a stationary phase versus the moving solvent. In a true solution, there aren’t any distinct particles to trap or layers to separate, so methods that rely on size, sedimentation, or immiscible layers aren’t suitable. Filtration depends on particle size to remove solids from a liquid, so it can’t separate dissolved species. Centrifugation separates by density in a mixture with two phases or suspensions, and a uniform solution doesn’t form separate layers to spin apart. Decanting works when there are immiscible liquids or a settled phase, but a homogeneous solution is a single phase with all components dissolved, so decanting won’t split it.

Chromatography, on the other hand, separates components based on how each one partitions between a stationary phase and a mobile phase. Different components interact differently with the stationary phase, and with the solvent as it moves through, so they travel at different speeds and end up separated along the path. This makes chromatography the common method for separating components within a single-phase mixture.