Page 214 - Primary Five Science

Filtration

This is a process of separating

solid insoluble substance

(particles) from a liquid

 The method involves the use

of a filter paper , sieve , a

piece of cloth and a funnel

 The solid particles that re-

mains on the filter or sieve

are called residues and the

liquid that goes through the

filter / sieve is referred to as
a filtrate.

Filtration at home is used when

 Removing seeds from juice

 Removing tea leaves from tea

Crystallisation & Evaporation to Dryness

This is the separation of dissolved solid from a solution as well

-formed crystals

Evaporation to Dryness –

It’s separation of dissolved solid from a solution as crystals of

salt by evaporating all the liquid off.

Why crystallisation occur?

The solubility of most solutes decrease as temperature de-
crease, when the solution cools, it can’t hold more solute

(saturated) so the extra solute separates as pure crystals.