Home Categories Inorganic chemistry Sodium pyrosulfite
A7320012

Sodium pyrosulfite , ACS , 7681-57-4

Synonym(s):
E223;Natrii metabisulfis;Sodium disulfite;Sodium metabisulfite;Sodium pyrosulfite

CAS NO.:7681-57-4

Empirical Formula: 2Na.O5S2

Molecular Weight: 190.11

MDL number: MFCD00213787

EINECS: 231-673-0

Pack Size Price Stock Quantity
500G RMB119.20 In Stock
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Update time: 2022-07-08

PRODUCT Properties

Melting point: >300 °C (lit.)
Density  1.48
storage temp.  Store at +5°C to +30°C.
solubility  540 g/L (20°C)
form  Powder/Solid
Specific Gravity 1.48
color  White to slightly yellow
Odor Sulphorous
PH Range 4.5 at 50 g/l at 20 °C
PH 3.5-5 (50g/l, H2O, 20℃)
Water Solubility  540 g/L (20 ºC)
Sensitive  Air & Moisture Sensitive
Merck  14,8638
Exposure limits ACGIH: TWA 5 mg/m3
NIOSH: TWA 5 mg/m3
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

Description and Uses

Sodium Metabisulfite is a preservative and antioxidant that exists as crystals or powder having a sulfur dioxide odor. it is readily solu- ble in water. it is used in dried fruits to preserve flavor, color, and to inhibit undesirable microorganism growth. it prevents “black spots” due to oxidative deterioration in shrimp. it is used in maraschino cherries. it is found in lemon drinks as a preservative. see sulfur dioxide.

Safety

Symbol(GHS) 
GHS05,GHS07
Signal word  Danger
Hazard statements  H302-H318
Precautionary statements  P264-P270-P280-P301+P312-P305+P351+P338-P501
Hazard Codes  Xn,Xi
Risk Statements  22-31-41-36/37/38-52
Safety Statements  26-39-46-36-16
RIDADR  3260
OEB B
OEL TWA: 5 mg/m3
WGK Germany  1
RTECS  UX8225000
TSCA  Yes
HS Code  2832 10 00
PackingGroup  III
Toxicity LD50 orally in Rabbit: 1540 mg/kg LD50 dermal Rat > 2000 mg/kg

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