What is chromatography? What are its various applications and underline the basic principles involved?
What is Chromatography?
Chromatography is a technique used to separate the different components of a mixture. It helps in identifying whether a substance is pure or a mixture. If a substance gives more than one spot in a chromatography test, it is a mixture; if it gives only one spot, it is pure.
Basic Principle of Chromatography
Chromatography works on the principle that different components of a mixture are absorbed differently on a stationary phase and move at different speeds with the mobile phase. As a result, they get separated.
- Stationary Phase: The surface (like filter paper) on which separation takes place.
- Mobile Phase:The solvent which carries the mixture (like water or alcohol).
For example, in paper chromatography, colored substances like inks or dyes get separated because they move at different rates on the paper when dipped in water.
Applications of Chromatography
- To check the purity of substances – A pure substance shows only one spot on the chromatogram.
- To separate dyes in black ink – Different colors in black ink can be separated using paper chromatography.
- To detect and identify substances in a mixture.
- Used in forensic labs – To analyze blood, ink, or drug samples.
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