7789-12-0

Molecule structure of Sodium dichromate dihydrate (CAS NO.7789-12-0):

IUPAC Name: Disodium oxido-(oxido(dioxo)chromio)oxy-dioxochromium dihydrate 
Molecular Weight: 297.9981 g/mol
Molecular Formula: Cr₂H₄Na₂O₉ 
Density: 2.348 g/cm³
Melting Point: 91 °C(lit.)
Boiling Point: 400 °C
Water Solubility: 730 g/L (20 °C)
Sensitive: hygroscopic
H-Bond Donor: 2
H-Bond Acceptor: 9 
Exact Mass: 297.846095
MonoIsotopic Mass: 297.846095
Topological Polar Surface Area: 126
Heavy Atom Count: 13
Canonical SMILES: O.O.[O-][Cr](=O)(=O)O[Cr](=O)(=O)[O-].[Na+].[Na+]
InChI: InChI=1S/2Cr.2Na.2H2O.7O/h;;;;2*1H2;;;;;;;/q;;2*+1;;;;;;;;2*-1
InChIKey: JYDRNIYTFCBIFC-UHFFFAOYSA-N
EINECS: 234-190-3 
Classification Code: Mutation data; Tumor data

 Sodium dichromate dihydrate (CAS NO.7789-12-0) is mainly used for the manufacture of chrome yellow pigments, chromic anhydride, and other chromium salts. It is also used as analytical reagent, oxidant, antiseptic, and used in organic synthesis.

Chromium and its compounds are on the Community Right-To-Know List.

Hazard Codes: O, T+, N
Risk Statements: 45-46-60-61-8-21-25-26-34-42/43-48/23-50/53 
R45:May cause cancer. 
R46:May cause heritable genetic damage. 
R60:May impair fertility. 
R61:May cause harm to the unborn child. 
R8 :Contact with combustible material may cause fire. 
R21:Harmful in contact with skin. 
R25 :Toxic if swallowed. 
R26:Very toxic by inhalation. 
R34:Causes burns. 
R42/43:May cause sensitization by inhalation and skin contact. 
R48:Danger of serious damage to health by prolonged exposure. 
R23 :Toxic by inhalation. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 53-45-60-61 
S53:Avoid exposure - obtain special instructions before use. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S60:This material and its container must be disposed of as hazardous waste. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.
RIDADR: UN 3086 6.1/PG 1
WGK Germany: 3
RTECS: HX7750000
HazardClass: 5.1
PackingGroup: III
HS Code: 28413000
A confirmed carcinogen with experimental carcinogenic data. Probably a poison. A caustic irritant. Mutation data reported. It can react violently with hydrazine. When heated to decomposition it emits toxic fumes of Na₂O. See also SODIUM DICHROMATE and CHROMIUM COMPOUNDS.

OSHA PEL: CL 0.1 mg(CrO₃)/m³
ACGIH TLV: TWA 0.05 mg(Cr)/m³; Confirmed Human Carcinogen
NIOSH REL: TWA 0.025 mg(Cr(VI))/m³; CL 0.05/15M

For occupational chemical analysis use NIOSH: Chromium Hexavalent 7024.

 Sodium dichromate dihydrate (CAS NO.7789-12-0) is also named as Disodium dichromate dihydrate ; Chromic acid (H₂Cr₂O₇), disodium salt, dihydrate ; Chromic acid (H₂Cr₂O₇), disodium salt, dihydrate (9CI) ; Dichromic acid (H₂Cr₂O₇), disodium salt, dihydrate . Sodium dichromate dihydrate (CAS NO.7789-12-0) is orange crystals or needles. It is soluble in hot water. Sodium dichromate dihydrate can react with reducing agents to generate heat and products that may be gaseous (causing pressurization of closed containers). The products may themselves be capable of further reactions (such as combustion in the air). Reactions may be rapid but often requires initiation (heat, spark, catalyst, addition of a solvent). It can react violently with active metals, cyanides, esters, and thiocyanates. Corrosive to mucous membranes continuous exposure may lead to perforation of nasal septum. Conjunctivitis and lacrimation to eyes. Corrosive producing deep penetrating ulcers to exposed area. It has a harsh metallic taste. Sodium dichromate dihydrate may cause vertigo, thirst, abdominal pain, vomiting, shock, convulsions and coma.