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Elements, Compounds and Mixtures

What is Filtration?

Filtration is a separation technique that is
used to separate a solid that has
not dissolved in a liquid (for example a precipitate).

A filter paper is placed inside a glass funnel
and a container put beneath.

  Filtration showing a Filter Paper

The mixture of the solid and liquid is placed into the filter paper.
The liquid flows through the filter paper and in to the container.
The liquid in the container is called the filtrate.

The solid that remains in the filter paper is called the residue.
The residue can be dried by spreading it out on the filter paper
and allowing the liquid to evaporate.

A solid that dissolves in a liquid
can be separated by crystallisation.

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