What is the main purpose of column chromatography?

What is the main purpose of column chromatography?

• A. To measure the boiling point of compounds.
• B. To measure the color of solutions.
• C. To purify compounds and separate mixtures.
• D. To monitor solvent polarity.

Answer: (C)

Column chromatography is used to purify compounds and separate mixtures. It relies on a column packed with a solid stationary phase (like silica) through which a mobile phase (the solvent) flows. Each component of the mixture interacts with the stationary phase to a different extent; substances that interact weakly move with the solvent and elute quickly, while those that interact strongly travel more slowly and come out later. By collecting fractions as the mixture passes through, you can isolate individual components in pure form. This is the central purpose: to separate the components and obtain purer substances. The other options describe measuring a property (boiling point, color) or adjusting a parameter (solvent polarity), which are not the main aim of column chromatography.

Column chromatography is used to purify compounds and separate mixtures. It relies on a column packed with a solid stationary phase (like silica) through which a mobile phase (the solvent) flows. Each component of the mixture interacts with the stationary phase to a different extent; substances that interact weakly move with the solvent and elute quickly, while those that interact strongly travel more slowly and come out later. By collecting fractions as the mixture passes through, you can isolate individual components in pure form. This is the central purpose: to separate the components and obtain purer substances. The other options describe measuring a property (boiling point, color) or adjusting a parameter (solvent polarity), which are not the main aim of column chromatography.