Question

Name the separation technique you would follow to separate. 1.dyes from black ink. 2.A mixture of salt and ammonium chloride. 3 cream from milk. 4.sodium chloride(nacl) from its solution in water.​

Answer 1

1. evaporation
2. sublimation
3. sieving
4. evaporation

Answer 2

The separation techniques for the given mixtures are as follows -

1) Dyes from black ink :

Chromatography is the useful method here. Because, chromatography is used for the seperation process of various complex organic and inorganic substances, including the ink and other colour substances.

2) Salt and ammonium chloride :

Sublimation process is the most appropriate method of seperation because the ammonium chloride can be evaporated by a little application of heat energy.

3) Cream and milk :

Cream and milk are always in a form of colloidal solution and that's why the centrifugation process is useful here. The cream and milk will be separated from each other by the application of centrifugal force.

4) Sodium chloride and water :

We can easily use the method of simple distillation to separate sodium chloride and water from each other.