The law of mass action

LC3.5.3.1
The law of mass action
The law of mass action

Description

The law of mass effect states that in equilibrium, products and reactants are in a constant ratio to each other. This can be shown clearly with the reaction of iron ions and thiocyanate to form the deep red iron thiocyanate. Dilution shifts the equilibrium to the side of the reactants. The students realise from the colour of the solution that the equilibrium can be shifted in both directions and that product or reactant do not disappear completely.

Components of equipment sets

1 6718700  4 
Iron(III) chloride-6-hydrate, 50 g LD
GHS05GHS07 Danger H302 H315 H318
1 6727400  4 
Potassium thiocyanate, 100 g LD
GHS07 Warning H302 EUH032 H312 H332 H412
1 6753410  4 
Water, pure, 5 l LD
1 30945  4 
Universal pencil LD
1 665212  4 
Glass stirring rod 200 x 8 mm Ø LD
1 667027  4 
Tweezers, blunt, 130 mm LD
2 6659541  8 
Rubber bulb LD
1 6045682  4 
Powder spatula, steel, 185 mm LD
2 6659531  4 
Dropping pipette 150 mm x 7 mm Ø LD
1 667057  4 
Test tube rack metal, 20 mm Ø LD
4 6640421  4 
Test tube Fiolax 16 mm x 160 mm LD
1 610010  8 
Laboratory safety goggles LD
1 6753410  4 
Water, pure, 5 l LD
1 6718700  4 
Iron(III) chloride-6-hydrate, 50 g LD
GHS05GHS07 Danger H302 H315 H318
1 6727400  4 
Potassium thiocyanate, 100 g LD
GHS07 Warning H302 EUH032 H312 H332 H412
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