SODIUM SULFIDE

SODIUM SULFIDE
PRODUCT IDENTIFICATION
CAS NO.	1313-82-2
EINECS NO.	215-211-5
FORMULA	Na₂S
MOL WT.	78.04
H.S. CODE	2832.10
TOXICITY	Oral rat LD50: 208 mg/kg
SYNONYMS	Sodium monosulfide; Hesthsulphid; Sodium sulfuret;
Disodium monosulfide; Disodium sulfide; Sodium Sulphide;
DERIVATION
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE	yellow to red flakes
MELTING POINT
BOILING POINT
SPECIFIC GRAVITY	1.86
SOLUBILITY IN WATER	Soluble (slightly soluble in alcohol)
pH	Alkaline
VAPOR DENSITY
AUTOIGNITION
NFPA RATINGS	Health: 3 Flammability: 0 Reactivity: 0
REFRACTIVE INDEX
FLASH POINT
STABILITY	Stable under ordinary conditions. Oxidizes in air .
GENERAL DESCRIPTION & APPLICATIONS
Sodium Sulfide is a yellow to red solid; readily soluble in water, slightly soluble in alcohol. It is a strong reducing agent and reacts with oxidants. It is primarily used in pulp and paper industry. It is used in water treatment as an oxygen scavenger agent, in the photographic industry to protect developer solutions from oxidation, in textile industry as a bleaching, as a desulfurizing and as a dechlorinating agent and in leather trade for the sulfitization of tanning extracts. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of rubber chemicals, sulfur dyes and other chemical compounds. It is use in other applications include ore flotation, oil recovery, food preservative, making dyes, and detergent.
SALES SPECIFICATION
GRADE I
APPEARANCE	red flakes
Na₂S	60.0% min
Na₂CO₃	2.0% max
Fe	0.15% max
WATER INSOLUBLES	0.5% max
GRADE II
APPEARANCE	yellow flakes
Na₂S	60.0% min
Na₂CO₃	2.0% max
Na₂SO₃	2.0% max
Na₂S₂O₃	2.0% max
Fe	0.15% max
WATER INSOLUBLES	0.5% max
TRANSPORTATION
PACKING	25kgs , 1mt in Bag
HAZARD CLASS	4.2 (Packing Group: II )
UN NO.	1385, 1849
EUROPEAN LABELING IN ACCORDANCE WITH EC DIRECTIVES
Hazard Symbols: C, Risk Phrases: 31-34, Safety Phrases: 3/14-24/25-26-28-45
OTHER INFORMATION
Sulfate (also spelled sulphate in Europe) is any chemical compound containing the SO₄^2- ion related to sulfuric acid (H₂SO₄). Sulfates are salts or esters of sulfuric acid, formed by replacing one or both of the hydrogens with a metal or a radical as in sodium sulfate, Na₂SO₄. Sulfates in which both hydrogens are replaced are called normal sulfates. Bisulfate is a compound that has the HSO₄^- radical. Bisulfate (called also hydrogen sulfate or acid sulfate) is a compound formed by replacing only one hydrogen in sulfuric acid. Sulfite (also sulphite) is a compound that contain the sulfite ion SO₃^2-. Sulfites are salts or esters of sulfurous acid (H₂SO₃), formed by replacing one or both of the hydrogens with a metal or a radical as in sodium sulfite, Na₂SO₃. Sulfites in which both hydrogens are replaced are called normal sulfites. Bisulfite is a compound that has the HSO₃^- radical. Bisulfate (called also hydrogen sulfite or acid sulfite) is a compound formed by replacing only one hydrogen in sulfurous acid. The term of 'meta' or 'pyro' is the chemical prefix for oxo acid formed through the loss of one water molecule (dehydration) from two molecules of ortho acid by heating. Pyrosulfuric acid is an example ( 2H₂SO₄ - H₂O = H₂S₂O₇). Ortho acid is the compound fully hydrated acid or its salts. Orthophosphoric acid is an example (2·H₃PO₄ = P₂O₅^.3H₂O), in contrast to the less hydrated form, pyrophosphoric acid (2·HPO₃ = P₂O₅^.H₂O). Na₂O₅S₂ is called sodium metabisulfite (2·HNaO₃S - H₂O). Sulfide is a compound having one or more sulfur atoms in which the sulfur is connected directly to a carbon, metal, or other nonoxygen atom; for example sodium sulfide, Na₂S. Sulfide ion is S^2- with oxidation number -2. Bisulfide ion is an anion formed by two sulfur atoms having an overall -2 charge, (S₂)^2-. Sulfamate is a salt of sulfamic acid (HSO₃NH₂). Calcium sulfamate Ca(SO₃NH₂)₂ is an example.