7681-57-4 Sodium metabisulfite

Superiority:

Product Name: Sodium metabisulfite
Synonyms: SODIUM META-BISULFITE GRAN;BC-024 Adherent;Sodiummetabisulfite,ACS,97%min;Sodium metabisulfite, anhydrous, extra pure, 97%;Sodium metabisulfite, for analysis ACS, 97+%;SODIUM META BISULFITE REAGENT (ACS);sodium metabisulfite, acs;SODIUMMETABISULFITE,ANHYDROUS,GRANULAR,REAGENT,ACS
CAS: 7681-57-4
MF: 2Na.O5S2
MW: 190.11
EINECS: 231-673-0
Product Categories: INORGANIC & ORGANIC CHEMICALS;Inorganics;inhibitor and freshen agent
Mol File: 7681-57-4.mol

Sodium metabisulfite Chemical Properties
Melting point  150 °C
density  1.48
storage temp.  Store at RT.
solubility  540 g/L (20°C)
form  Powder/Solid
color  White to slightly yellow
Specific Gravity 1.48
Odor Sulphorous
PH 3.5-5 (50g/l, H2O, 20℃)
PH Range 4.5 at 50 g/l at 20 °C
Water Solubility  540 g/L (20 ºC)
Sensitive  Air & Moisture Sensitive
Merck  14,8638
Stability: Stable. Incompatible with strong oxidizing agents, strong acids. Contact with strong acids releases a poisonous gas. May be moisture and air sensitive.
InChIKey HRZFUMHJMZEROT-UHFFFAOYSA-L
CAS DataBase Reference 7681-57-4(CAS DataBase Reference)
EPA Substance Registry System Sodium metabisulfite (7681-57-4)
Safety Information
Hazard Codes  Xn,Xi
Risk Statements  22-31-41-36/37/38-52
Safety Statements  26-39-46-36-16
RIDADR  3260
WGK Germany  1
RTECS  UX8225000
TSCA  Yes
HS Code  2832 10 00
PackingGroup  III
Hazardous Substances Data 7681-57-4(Hazardous Substances Data)
Toxicity LD50 orally in Rabbit: 1540 mg/kg LD50 dermal Rat > 2000 mg/kg

Sodium metabisulfite Usage And Synthesis
Description Sodium metabisulfite (chemical formula: Na2S2O5) appears as a white crystalline or powder solid with a slight sulfur odor. It is toxic upon inhalation and can strongly irritate skin and tissue. It can be decomposed to release toxic oxide fumes of sulfur and sodium upon high temperature. It can be mixed with water to form a corrosive acid. It is generally used as disinfectant, antioxidant, and preservative agent as well as a laboratory reagent. As a kind of food additive, it can be used as a preservative and antioxidant in food. It can also be applied to the wine and beer making. Moreover, it can be used to sanitize the equipment of homebrew and winemaking as a cleaning agent. It also have various kinds of other applications, e.g. being applied to photography, as an excipients in some tablets, for water treatment, as a source of SO2 in wine, as a bactericide and as a bleaching reagent as well as reducing agent. It can be manufactured through the evaporation of a sodium bisulfite which has been saturated with sulfur dioxide. It should be warned that sodium metabisulfite has certain acute effects on the respiratory system, eyes and skin. In severe case, it can cause breathing difficulty and even pulmonary damage which finally leads to death. Therefore, effective protective measures and attention should be taken during the operation.