Sodium hydrosulfite

Name

Sodium hydrosulfite

C A S

7775-14-6

EINECS

231-890-0

molecular formula

Na₂O₄S₂

molecular weight

174.09

Character:
Anhydrous is dihydrate and two, the former is smaller granular white powder, ginger powder for the latter. 2.3-2.4g/cm³ density. Soluble in water, micro-soluble alcohol. In aqueous solution of instability, hydrolysis produces hydrogen. Dihydrate in alkaline solution into water that is heated objects. Dried break down fever and can lead to burning. Heated to 75C above decomposition, heat and emit sulfur dioxide. 250C can be spontaneous. With strong reduction, which will air oxidation as sodium bisulfite and sodium bisulfate.

Application:

Widespread applications for the printing and dyeing industries, as Yong help dye the fabric, printed cloth of brandy, dyes, silk, wool bleaching agent. The food industry for juice, sugar and other food bequeath bleach. The chemical industry used for preparing sodium thiosulfate, thiourea, Thio benzoin acid, Rongalite, synthetic dyes and other raw materials. Also for copperplate printing and other reagents for the analysis..