Write notes on the following :(a) Distillation(b) Chromatography

1.	Write notes on the following :(a) Distillation(b) Chromatography
Answer» (a) Distillation : This method is used to separate (i) Volatile liquids from non volatile impurities. (ii) The liquids having difference in their boiling points. liquids having different boiling points vapourises at different temperatures. These vapours are cooled and the liquids formed are collected separately. Eg : CHCl₃ (b.pt.334K) and C₆H₅NH₂ (b.pt.457k) are easily separated by distillation technique. (b) Chromatography : This is a technique for the separation, purification and identification of the constituents of mixtures. It is based on the principle of selective adsorption of components of a mixture between two phases, a stationary phase and a moving phase. The stationary phase can be a solid or a liquid while a moving phase is a liquid or gas.

Answer»

(a) Distillation : This method is used to separate

(i) Volatile liquids from non volatile impurities.

(ii) The liquids having difference in their boiling points.

liquids having different boiling points vapourises at different temperatures. These vapours are cooled and the liquids formed are collected separately.

Eg : CHCl₃ (b.pt.334K) and C₆H₅NH₂ (b.pt.457k) are easily separated by distillation technique.

(b) Chromatography : This is a technique for the separation, purification and identification of the constituents of mixtures. It is based on the principle of selective adsorption of components of a mixture between two phases, a stationary phase and a moving phase. The stationary phase can be a solid or a liquid while a moving phase is a liquid or gas.

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