Extraction of (s)+(s)
Extraction of a solid mixture means: adding a solvent in which one of the components will dissolve and the other not.
Then you can separate the solution form the remaining solid, by starting the filtration.
Finally you can - if desired - evaporate the solvent and stay with the solid component.
This way hot water can extract certain substances from thea leaves. You separate components from each other and the soluble components are consumed.
The remaining substances (what's left from the leaves) is thrown away.
A mixture of Iodine and Potassium permanganate kan be separated by adding alcohol. The Iodine dissolves, but the salt does not.
And what about making coffee?
Some special extractions are:
- when heating the same mixture as above (Iodine + permanganate (= (s) + (s)) the Iodine will evaporate.
But immediately at some cooling, the Iodine will sublimate at the walls of the device (use a glass funnel and you will observe the Iodine cristals coming back, and separated from the salt cristals.
- From a mixture of Iron and Sulphur powder, you can 'extract' the Iron with a magnet.