Allied solutions

Allied solutions

Grade 8

Elements, Compounds and Mixtures | Exercise

Question 12

Q12) Explain with diagrams the process used to - separate the following substances from the given mixtures.

  1. Ammonium Chloride from a mixture of ammonium chloride & potassium chloride
  2. Iron from a mixture of Iron & copper
  3. Sulphur from a mixture of - sulphur & copper
  4. Potassium nitrate from a mixture of - potassium nitrate & Potassium chlorate
  5. Lead Carbonate (insoluble) from a mixture of - lead carbonate & water.
  6. Lead nitrate (soluble) from a mixture of lead nitrate & water i.e. lead nitrate solution.
  7. Carbon tetrachloride from a mixture of - carbon tetrachloride (heavier component) & water.
  8. Benzene from a mixture of - benzene & toluene.
  9. Different dyes - in their liquid constituent ink.

Solution:

  1. Ammonium Chloride from a mixture of ammonium chloride & potassium chloride

Sublimation:

A - Ammonium Chloride

B - Potassium Chloride

When the evaporating dish is heated, ammonium chloride sublimes on the walls of the funnel and potassium chloride is left behind in the dish

  1. Iron from a mixture of Iron & copper

Magnetic Separation:

A - Iron

B - Copper

When the magnet is brought closer to the mixture, iron pieces get attracted to the magnet and stick to it

  1. Sulphur from a mixture of - sulphur & copper

Solvent Extraction:

A - Sulphur

B - Copper

The solvent is carbon disulphide where sulphur dissolves. Now when this mixture is filtered, copper remains on the filter paper sulphur passes into the beaker, which is separated during evaporation.

  1. Potassium nitrate from a mixture of - potassium nitrate & Potassium chlorate

Heating & Cooling:

The mixture is heated to get a saturated solution and it crystallises on cooling. Now since, potassium nitrate is more soluble it gets filtered out from the hot saturated solution and recrystallised in hot water and then dried. This separates the two mixtures into crystals.

  1. Lead Carbonate [insoluble] from a mixture of - lead carbonate & water.

Evaporation:

The water evaporates during heating, and a black solid is left behind which is lead carbonate.

  1. Lead nitrate [soluble] from a mixture of lead nitrate & water i.e. lead nitrate solution.

Crystallisation

  1. Carbon tetrachloride from a mixture of - carbon tetrachloride [heavier component] & water.

Separating funnel:

Carbon tetrachloride is heavier, hence it forms the lower layer and collects in the flask, while water remains in the funnel.

  1. Benzene from a mixture of - benzene & toluene.

Fractional distillation:

On heating, benzene evaporates because it has a lower boiling point and condenses in and collects in flask ‘Y’, while toluene remains in flask ‘Y’ because it has a high boiling point.

  1. Different dyes - in their liquid constituent ink.

Chromatography:

Ink spots contain different solid constituents. It is kept on the filter paper. The lower end of filter paper is dipped in the solvent and hung. The solvent flows over the ink spot and the dyes separate out.

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Question 12

Q12) Explain with diagrams the process used to - separate the following substances from the given mixtures.

  1. Ammonium Chloride from a mixture of ammonium chloride & potassium chloride
  2. Iron from a mixture of Iron & copper
  3. Sulphur from a mixture of - sulphur & copper
  4. Potassium nitrate from a mixture of - potassium nitrate & Potassium chlorate
  5. Lead Carbonate (insoluble) from a mixture of - lead carbonate & water.
  6. Lead nitrate (soluble) from a mixture of lead nitrate & water i.e. lead nitrate solution.
  7. Carbon tetrachloride from a mixture of - carbon tetrachloride (heavier component) & water.
  8. Benzene from a mixture of - benzene & toluene.
  9. Different dyes - in their liquid constituent ink.

Solution:

  1. Ammonium Chloride from a mixture of ammonium chloride & potassium chloride

Sublimation:

A - Ammonium Chloride

B - Potassium Chloride

When the evaporating dish is heated, ammonium chloride sublimes on the walls of the funnel and potassium chloride is left behind in the dish

  1. Iron from a mixture of Iron & copper

Magnetic Separation:

A - Iron

B - Copper

When the magnet is brought closer to the mixture, iron pieces get attracted to the magnet and stick to it

  1. Sulphur from a mixture of - sulphur & copper

Solvent Extraction:

A - Sulphur

B - Copper

The solvent is carbon disulphide where sulphur dissolves. Now when this mixture is filtered, copper remains on the filter paper sulphur passes into the beaker, which is separated during evaporation.

  1. Potassium nitrate from a mixture of - potassium nitrate & Potassium chlorate

Heating & Cooling:

The mixture is heated to get a saturated solution and it crystallises on cooling. Now since, potassium nitrate is more soluble it gets filtered out from the hot saturated solution and recrystallised in hot water and then dried. This separates the two mixtures into crystals.

  1. Lead Carbonate [insoluble] from a mixture of - lead carbonate & water.

Evaporation:

The water evaporates during heating, and a black solid is left behind which is lead carbonate.

  1. Lead nitrate [soluble] from a mixture of lead nitrate & water i.e. lead nitrate solution.

Crystallisation

  1. Carbon tetrachloride from a mixture of - carbon tetrachloride [heavier component] & water.

Separating funnel:

Carbon tetrachloride is heavier, hence it forms the lower layer and collects in the flask, while water remains in the funnel.

  1. Benzene from a mixture of - benzene & toluene.

Fractional distillation:

On heating, benzene evaporates because it has a lower boiling point and condenses in and collects in flask ‘Y’, while toluene remains in flask ‘Y’ because it has a high boiling point.

  1. Different dyes - in their liquid constituent ink.

Chromatography:

Ink spots contain different solid constituents. It is kept on the filter paper. The lower end of filter paper is dipped in the solvent and hung. The solvent flows over the ink spot and the dyes separate out.

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subject-cta
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