Sodium dichromate dihydrate
Sodium dichromate dihydrate Chemical Properties
- Melting point:
- 91 °C(lit.)
- Boiling point:
- 2,348 g/cm3
- vapor density
- 10 (vs air)
- Specific Gravity
- PH Range
- Water Solubility
- 730 g/L (20 ºC)
- CAS DataBase Reference
- 7789-12-0(CAS DataBase Reference)
- EPA Substance Registry System
- Disodium dichromate dihydrate (7789-12-0)
Sodium dichromate dihydrate Usage And Synthesis
Orange-yellow powder. Soluble in acids and hot water; insoluble in alcohol and ether.
Sodium chromate, including the hexahydrate, is yellow crystalline solids that can also be used in solution. Disodium dichromate (10588-01-9):
It is used in preparation of titrant in redox titrations.
A 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.
Solid orange-yellow crystal or powder.
Air & Water Reactions
Water soluble (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). Can react violently with active metals, cyanides, esters, and thiocyanates.
Toxic by ingestion and inhalation.
INHALATION: 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.
Used 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.
UN3087 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.
Crystallise 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.
Aqueous solution in a base. A strong oxidizer. Violent reaction with reducing agents; combustibles, strong acids; organic materials.
Sodium dichromate dihydrate Preparation Products And Raw materials
- Sodium chromate
- Ammonium dichromate
- SODIUM DICHROMATE / SULFURIC ACID
- Coal, brown, reaction products with sodium dichromate, neutralized
- SODIUM BICHROMATE DIHYDRATE,SODIUM DICHROMATE 2H2O,SODIUM DICHROMATE-2-HYDRATE,SODIUM DICHROMATE, HYDROUS
- Sodium dichromate: (Disodium dichromate),sodium dichromate anhydrate,Sodium Bichromate - Carc.
- CHROMIUM (III) OXIDE HYDRATE, 98
- Sodium acetate
- Sodium chloride
- Sodium bicarbonate
- Sodium carbonate
- Sodium formate
- Sodium hydroxide
- Sodium gluconate
- Sodium dichromate dihydrate
- Diclofenac sodium