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Sodium dichromate dihydrate

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Name

Sodium dichromate dihydrate

EINECS 234-190-3
CAS No. 7789-12-0 Density 2.348 g/cm3
PSA 142.09000 LogP -0.90980
Solubility 730 g/L (20 °C) in water Melting Point 91 °C(lit.)
Formula Cr2H4Na2O9 Boiling Point 400 °C
Molecular Weight 298.02 Flash Point N/A
Transport Information UN 3086 6.1/PG 1 Appearance orange crystals or needles
Safety 53-45-60-61 Risk Codes 45-46-60-61-8-21-25-26-34-42/43-48/23-50/53
Molecular Structure Molecular Structure of 7789-12-0 (Sodium dichromate dihydrate) Hazard Symbols OxidizingO, VeryT+, DangerousN
Synonyms

Chromicacid (H2Cr2O7), disodium salt, dihydrate (9CI);Dichromic acid (H2Cr2O7),disodium salt, dihydrate (8CI);Dichromic acid, disodium salt, dihydrate;Disodium dichromate dihydrate;Sodium chromate (Na2Cr2O7) dihydrate;Sodiumdichromate (Na2Cr2O7) dihydrate;Chromic acid (H2Cr2O7),sodium salt, hydrate (1:2:2);Sodium dichromatedihydrate (Na2Cr2O7.2H2O);

 

Sodium dichromate dihydrate Chemical Properties

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 Uses

 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.

Sodium dichromate dihydrate Toxicity Data With Reference

1.    

mmo-sat 50 µg/plate

    CRNGDP    Carcinogenesis. 5 (1984),505.
2.    

slt-dmg-orl 2340 µm/L

    MUREAV    Mutation Research. 157 (1985),157.

Sodium dichromate dihydrate Consensus Reports

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

Sodium dichromate dihydrate Safety Profile

Hazard Codes: OxidizingO, VeryT+, DangerousN
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.

Sodium dichromate dihydrate Standards and Recommendations

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

Sodium dichromate dihydrate Analytical Methods

For occupational chemical analysis use NIOSH: Chromium Hexavalent 7024.

Sodium dichromate dihydrate Specification

 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.