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1.10 Filtration

A paper filter

 Filter first

Filtration is any of various mechanical, physical or biological operations that separates solids from fluids by adding a medium through which only the fluid can pass.

The fluid that passes through is called the filtrate

A fluid is a liquid or gas

Here we will consider filtration as a simple technique used  to separate insoluble solids from a mixture with or suspension in a liquid

Sometimes it is the filtrate that we want to isolate ( as in the making of a cup of coffee), on other occasions it is the residue that is left behind in the filter that is of value to us.


 Activity 1. Faster filtration

suction filtration

​In the laboratory suction filtration can speed up the process and help to dry the insoluble residue on the filter paper.

Task 1

Make a copy of the suction filtration diagram. Add labels to the diagram to help explain why a vacuum pump is used.

What's the connection?

 Odd one out?

figure 1
figure 2
figure 3
figure 4

Compare the four images shown here. 

All four images represent a type of filtration.

Copy and complete the table below:

​Filtrate ​Residue  ("filtride")
​Figure 1
​Figure 2
​Figure 3
​Figure 4

 Which image is the odd one out and why ? ( there is more than one acceptable answer - so long as you justify it)

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