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In this Science (Chemistry) video in Hindi for class 9 we explained different techniques to separate two or more components of a mixture. Heterogeneous mixtures can be separated into their respective constituents by simple physical methods like handpicking, sieving, filtration that we use in our day-to-day life.
Sometimes special techniques have to be used for the separation of the components of a mixture.

1) Separation by evaporation : We can separate the volatile component (solvent) from its non-volatile solute by the method of evaporation. This technique is used to extract salt from sea water.

2) Separation by centrifugation : The principle is that the denser particles are forced to the bottom and the lighter particles stay at the top when spun rapidly.
Applications :-
a) Used in diagnostic laboratories for blood and urine tests.
b) Used in dairies and home to separate butter from cream.
c) Used in washing machines to squeeze out water from wet clothes.

3) Separating two immiscible liquids : The principle is that immiscible liquids separate out in layers depending on their densities.
Applications :-
a) To separate mixture of oil and water.
b) In the extraction of iron from its ore, the lighter slag is removed from the top by this method to leave the molten iron at the bottom in the furnace.

4) Separation by sublimation : This technique is used to separate sublimable volatile component from a non-sublimable impurity.

5) Separation by chromatography : This technique is used for separation of those solutes that dissolve in the same solvent.
Applications :-
a) To separate colours in a dye
b) To separate pigments from natural colours
c) To separate drugs from blood.

6) Separation by distillation : It is used for the separation of components of a mixture containing two miscible liquids that boil without decomposition and have sufficient difference in their boiling points.

7) Separation by fractional distillation : It is used for the separation of components of a mixture containing two miscible liquids that boil without decomposition and the difference in their boiling points is less than 25℃.

8) Separation by crystallisation : Crystallisation is a process that separates a pure solid in the form of its crystals from a solution.
Applications :-
a) Purification of salt that we get from sea water.
b) Separation of crystals of alum (phitkari) from impure samples.

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???? Click here to watch the whole playlist on Chapter 2 : 'Is Matter Around us Pure' for Class 9 :

muxy.net/www.chat.irish/watch?v=kbn4XVL8bqU&list=PL51pHkbQg-tcutvOax3QB62DSU59x-geY&index=2&t=0s

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Previous videos -

???? Is Matter Around us Pure ?
muxy.net/youtu.be/kbn4XVL8bqU

???? Solution
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???? Suspension
muxy.net/youtu.be/zSfdsCPt5xk

???? Colloidal Solution
muxy.net/youtu.be/JB_9ZbUoEFE

Date Added: 2020-12-18

Category: Girlie

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