Question

17. Name the technique used to
separate (i) dyes in blue - black
ink (ii) Camphor from sodium
chloride.
Your answer​

Answer 1

$\huge\bf { AnSwER : }$

☞ (i) Evaporation

Blue or black dye can be separated from ink by the process of evaporation. Ink is a colloidal solution and a heterogeneous mixture of dye and water. Heating leads to evaporation of water. This leaves behind dye in watch-glass.

☞(ii) Sublimation

Sublimation is a technique used to separate the components of a mixture containing a sublimable volatile solid and a non-sublimable impurity. Therefore, the mixture of camphor and sodium chloride can be separated by the process of sublimation.

Answer 2

Here is your answer

i ) Blue or black dye can be separated from ink by the process of evaporation. Ink is a colloidal solution and a heterogeneous mixture of dye and water. Heating leads to evaporation of water. This leaves behind dye in watch-glass.

ii )Camphor is separated from NaCl by Sublimation.

Camphor is separated from NaCl by Sublimation.On heating, camphor is collected on the inner surface of the inverted funnel while NaCl left in the dish.

Note: Sublimation is the process of heating a solid to obtain vapours.

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