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Sodium metabisulfite
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Sodium metabisulfite : ウィキペディア英語版
Sodium metabisulfite

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Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to as ''disodium'' (metabisulfite). It is used as a disinfectant, antioxidant and preservative agent.
==Preparation==
Sodium metabisulfite can be prepared by evaporating a solution of sodium bisulfite saturated with sulfur dioxide:
: 2 HSO3 (unicode:⇌) H2O + S2O52−
which leaves solid Na2S2O5 behind.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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