Sodium Metabisulfite – Sodium disulfite – 500gm, Merck – Germany.
Sodium metabisulfite or sodium pyrosulfite is an inorganic compound of the chemical formula Na2S2O5. The substance is sometimes referred to as disodium metabisulfite. It is used as a disinfectant, antioxidant, and preservative agent.
Uses of Sodium Metabisulfite:
Sodium and potassium metabisulfite has many major and niche uses. It is widely used for preserving food and beverages.
In combination with sodium hydrosulfite, it is used as a rust-stain remover.
It is used in photography.
Concentrated sodium metabisulfite can be used to remove tree stumps. Some brands contain 98% sodium metabisulfite, and cause degradation of lignin in the stumps, facilitating removal.
It is also used as an excipient in some tablets, such as paracetamol.