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Separations for SQA National 5 Chemistry

Separations

This page covers the following topics:

1. Filtration

Filtration is a technique used to separate a mixture of insoluble solids and a liquid. Filtration is possible due to the size differences of solid and liquid particles. Smaller liquid molecules can pass through a filter paper in a funnel to form filtrate, while larger solid particles cannot, forming residue. Dissolved ions are small enough to pass through the holes in the filter paper.

Filtrate is a filtered liquid which has passed through a filter paper. Residue is a solid which has been filtered out of a mixture and remains on the filter paper.

Filtration

1

What is residue?

Residue is a solid which has been filtered out of a mixture and remains on the filter paper.

a solid left on a filter paper after filtration

What is residue?

2

Name A, B and C in the diagram provided.

Filtration is a technique used to separate a mixture of insoluble solids and a liquid. Smaller liquid molecules can pass through a filter paper in a funnel to form filtrate, while larger solid particles cannot, forming residue.

A is funnel, B is mixture/residue, C is filtrate.

Name A, B and C in the diagram provided.

3

Can filtration be used to separate sand and water? Explain your answer.

Filtration is a technique used to separate a mixture of insoluble solids and a liquid. Filtration is possible due to the size differences of solid and liquid particles. Since sand is insoluble in water and it has significantly larger particles than water, sand and water can be separated using filtration.

Yes, sand is insoluble in water and it has larger particles than water.

Can filtration be used to separate sand and water? Explain your answer.

4

Explain why filtration cannot separate liquid from its dissolved ions.

Dissolved ions are small enough to pass through the holes in a filter paper.

Dissolved ions pass through a filter paper.

Explain why filtration cannot separate liquid from its dissolved ions.

5

Why could filtration not be used to separate NaCl and water?

Filtration is a technique used to separate a mixture of insoluble solids and a liquid. NaCl is soluble in water; thus, NaCl and water cannot be separated using filtration.

NaCl is soluble in water.

Why could filtration not be used to separate NaCl and water?

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