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Q58 (CISF/2022) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Dyes in black ink can be separated by :

Explanation

Chromatography is the technique used for the separation of those solutes that dissolve in the same solvent. In the case of black ink, the ink is a mixture of two or more dyes in a solvent (usually water). When a strip of filter paper with an ink spot is dipped in water, the water rises by capillary action. As the water moves up, it carries the dye particles with it. Since different dyes have different solubilities in the solvent, the component that is more soluble rises faster, resulting in the separation of different colored layers on the paper.

  • Evaporation separates a non-volatile solute from a volatile solvent.
  • Centrifugation separates particles based on density (e.g., cream from milk).
  • Sublimation separates a substance that changes directly from solid to gas (e.g., ammonium chloride) from non-sublimable impurities.
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