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Specification Of Sodium Hydrosulphite


 
PRODUCT IDENTIFICATION
CAS NO. 7775-14-6
EINECS NO. 231-890-0
FORMULA Na2 O4 S2 (Sodium Dithionite)
MOL WT. 174.10

HS CODE

2831.10
TOXICITY

Oral Rat LD 50: 5 g/kg.
SYNONYMS
Sodium dithionite; Reductone; Vatrolite;Sodium sulfoxylate; Dithionous acid,disodium salt;
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE White crystalline powder with weak sulforous odor
MELTING POINT 52C
BOILING POINT Decomposes
SPECIFIC GRAVITY 2.19 - 2.20
SOLUBILITY IN WATER Soluble (insoluble in alcohol)
pH Acidic in solution

NFPA RATINGS

 Health: 2; Flammability: 3; Reactivity: 1
FLASH POINT 90 C
STABILITY Stable under ordinary conditions (Decomposes in hot water and acid)
SALES SPECIFICATION

APPEARANCE

White to Gray-White crystalline powder
Na2 O4 S2

85% or 88% or 90% min

INSOLUBLES IN WATER

 0.1% max

Na2S2O3

 1.2% max

Na2S2O5

 5-7%

NaHSO3

 0.5% max

Na2CO3

 0.6-2%

HCOONa

 0.5% max

Zn

0.0001% max

Pb

0.0001% max

Fe

 0.005% max



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