One impressive example of osmotic processes is the "chemical garden". Metal salts dropped into a solution of sodium silicate react with the silicate immediately, forming non-soluble silicate shells, which stop the reaction from proceeding further. However the shells remain permeable to water, so that an aqueous salt solution arises inside them and its pressure is higher than the pressure outside the shell due to the higher concentration. This causes the shells to burst, releasing the salt solution. However, the released salt immediately forms a new shell. This means that crystals grow in quick bursts into all sorts of bizarre shapes.
| Materiallist (Excerpt) |
Product |
Amount |
|
Manganese-II chloride,crys. 250 g
|
31556-25
|
1
|
|
Copper-II sulphate,cryst. 250 g
|
30126-25
|
1
|
|
Sodium silicate solution 500 ml
|
31653-50
|
1
|
|
Iron-III chloride, 250 g
|
30069-25
|
1
|
|
Zinc sulphate 7-hydr. 250 g
|
30249-25
|
1
|
|
Glass beaker DURAN®, tall, 400 ml
|
36005-00
|
1
|
|
Tweezers,straight,blunt, 130 mm
|
64610-00
|
1
|
|
Spoon, special steel
|
33398-00
|
1
|
|
Wash bottle, plastic, 500 ml
|
33931-00
|
1
|
|
Glass rod,boro 3.3,l=200mm, d=5mm
|
40485-03
|
1
|
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