Sodium Metabisulfite, 500g, Gold recovery

Description

Sodium Metabisulfite, 500g
Sodium metabisulfite, or sodium pyrosulfite, is commonly used to precipitate dissolved gold out of aqua regia and gold chloride solutions. Sodium metabisulfite is a white, slightly yellowish crystalline powder with a sulfur dioxide odor (rotten eggs), dissolving easily in water.
When mixed with water or a strong acid solution, it releases sulfur dioxide (SO
2
), a pungent, unpleasant smelling gas that can also cause breathing difficulties in some people. Released sulfur dioxide however makes the water a strong reducing agent, which is useful in many chemical and industrial applications.
Chemical Formula:
Na
2
S
2
O
5
Appearance:
White to yellow, free-flowing powder
Chemical Grade:
Technical
Quantity:
500g
CAS number:
7681-51-4