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Sodium dichromate dihydrate

Sodium dichromate dihydrate Basic information
Product Name:Sodium dichromate dihydrate
Product Categories:
Mol File:7789-12-0.mol
Sodium dichromate dihydrate Structure
Sodium dichromate dihydrate Chemical Properties
Melting point 91 °C(lit.)
Boiling point 400°C
density 2,348 g/cm3
form Solid
Specific Gravity2.348
color Red-orange
Water Solubility 730 g/L (20 ºC)
Sensitive Hygroscopic
Merck 14,8609
CAS DataBase Reference7789-12-0(CAS DataBase Reference)
EPA Substance Registry SystemChromic acid (H2Cr2O7), disodium salt, dihydrate(7789-12-0)
Safety Information
Hazard Codes O,T+,N
Risk Statements 45-46-60-61-8-21-25-26-34-42/43-48/23-50/53
Safety Statements 53-45-60-61
RIDADR UN 3086 6.1/PG 1
WGK Germany 3
RTECS HX7750000
HazardClass 5.1
PackingGroup III
HS Code 28413000
MSDS Information
Sodium dichromate English
SigmaAldrich English
ALFA English
Sodium dichromate dihydrate Usage And Synthesis
Chemical PropertiesOrange-yellow powder. Soluble in acids and hot water; insoluble in alcohol and ether.
Chemical PropertiesSodium chromate, including the hexahydrate, is yellow crystalline solids that can also be used in solution. Disodium dichromate (10588-01-9):
UsesIt is used in preparation of titrant in redox titrations.
DefinitionA red crystallinesolid, Na2Cr2O7.2H2O, solublein water and insoluble in ethanol. Itis usually known as the dihydrate(r.d. 2.52), which starts to lose waterabove 100°C; the compound decomposesabove 400°C. It is made bymelting chrome iron ore with limeand soda ash and acidification of thechromate thus formed. Sodiumdichromate is cheaper than the correspondingpotassium compound buthas the disadvantage of being hygroscopic.It is used as a mordant in dyeing,as an oxidizing agent in organicchemistry, and in analytical chemistry.
General DescriptionSolid orange-yellow crystal or powder.
Air & Water ReactionsWater soluble (hot water).
Reactivity ProfileSodium 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). Can react violently with active metals, cyanides, esters, and thiocyanates.
HazardToxic by ingestion and inhalation.
Health HazardINHALATION: Corrosive to mucous membranes continuous exposure may lead to perforation of nasal septum. EYES: Conjunctivitis and lacrimation. SKIN: Corrosive producing deep penetrating ulcers to exposed area. Slow to heal. INGESTION: Has a harsh metallic taste. May cause vertigo, thirst, abdominal pain, vomiting, shock, convulsions and coma.
Potential ExposureUsed to make dyes, inks, pigments, and other chromates; in leather tanning, a corrosion inhibitor in circulating water systems; metal treatment; a drilling mud additive; chemical intermediate for chromium catalysts; colorimetry, oxidizing agent; bleaching agent; an algicide, fungicide, insecticide; in wood preservation.
First aidIf this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. If victim is conscious, administer water, or milk. Do not induce vomiting.
ShippingUN3087 Oxidizing solid, toxic, n.o.s., Hazard Class: 5.1; Labels: 5.1-Oxidizer, 6.1-Poisonous materials, Technical Name Required. UN3085 Oxidizing solid, corrosive, n.o.s., Hazard Class: 5.1; Labels: 5.1-Oxidizer, 8-Corrosive material, Technical Name Required.
Purification MethodsCrystallise the dichromate from small volumes of H2O by evaporation to crystallisation. Its solubility in H2O is 238% at 0o and 508% at boiling. The red dihydrate is slowly dehydrated by heating at 100o for long periods. It is deliquescent and is a powerful oxidising agent—do not place it in contact with skin— wash immediately as it is caustic. (Possible carcinogen.) Sodium dihydrogen orthophosphate ( 2 H2O) [13472-35-0 (2H2O), 10049-21-5 (H2O), 7558-80-7 (anhydrous)] M 156.0, m 60o(dec), d 4 1.91. Crystallise it from warm water (0.5mL/g) by chilling.
IncompatibilitiesAqueous solution in a base. A strong oxidizer. Violent reaction with reducing agents; combustibles, strong acids; organic materials.
Tag:Sodium dichromate dihydrate(7789-12-0) Related Product Information
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