SODIUM DICHROMATE Chemical Properties

Melting point:

356.7°C

Density 

2.52 g/cm3(Temp: 13 °C)

vapor pressure 

0Pa at 20℃

form 

red hygroscopic crystals

color 

red hygroscopic crystals, crystalline

Water Solubility 

2355g/L at 20℃

Dielectric constant

2.9（Ambient）

LogP

-1 at 20℃

CAS DataBase Reference

10588-01-9(CAS DataBase Reference)

EPA Substance Registry System

Sodium dichromate (10588-01-9)

Safety Information

Hazard Codes 

T+,N,O

Risk Statements 

45-46-60-61-8-21-25-26-34-42/43-48/23-50/53

Safety Statements 

53-45-60-61

RIDADR 

3086

HazardClass 

6.1(a)

PackingGroup 

II

Hazardous Substances Data

10588-01-9(Hazardous Substances Data)

Toxicity

LD50 oral in rat: 50mg/kg

SODIUM DICHROMATE Usage And Synthesis

Chemical Properties

Sodium chromate, including the hexahydrate, is yellow crystalline solids that can also be used in solution. Disodium dichromate (10588-01-9):

Chemical Properties

Red or red-orange deliquescent crystals.Decomposes at 400C, loses 2H 2 O on prolonged heating at 100C. Soluble in water; insoluble in alcohol. Noncombustible.

Uses

Colorimetry (copper determination), complex- ing agent, oxidation inhibitor in ethyl ether.

Uses

Sodium dichromate is red solid, soluble, powerful oxidizing agent, and consequently a fire hazard with dry carbonaceous materials. Formed by acidifying sodium chromate solution, and then evaporating. Used (1) in matches and pyrotechnics, (2) in leather tanning and in the textile industry, (3) as a source of chromate, cheaper than potassium dichromate.

Definition

ChEBI: Sodium dichromate is an inorganic sodium salt. It contains a dichromate(2-).

General Description

A red or red-orange crystalline solid. May be strongly irritating to skin, eyes and mucous membranes. Used as a corrosion inhibitor, and in the manufacture of other chemicals.

Air & Water Reactions

Deliquescent. Soluble in water.

Reactivity Profile

SODIUM DICHROMATE is a strong oxidizing agent. Incompatible with strong acids. . Contact with combustible materials may lead to fires. Toxic chromium oxide fumes may form in fire [USCG, 1999]. The well known "chromic acid mixture" of dichromate and sulfuric acid with organic residue led to violent exothermic reaction. This mixture in combination with acetone residue also led to violent reaction. The combination of the dichromate and sulfuric acid with alcohols, ethanol and 2-propanol, led to violent exothermic reaction. Because of the occurrence of many incidents involving the dichromate-sulfuric acid mix with oxidizable organic materials, SODIUM DICHROMATE is probably best to avoid such interactions. The combination of the dichromate with hydrazine is explosive (one may expect the reaction of the dichromate to be vigorous with amines in general), [Mellor, 1943, Vol. 11, 234]. The addition of the dehydrated dichromate salt to acetic anhydride led to an exothermic reaction which eventually exploded. An induction period proceeded the explosion event [Bretherick, 5th Ed., 1995]. Boron, silicon, and dichromates form pyrotechnic mixtures. A mixture of acetic acid, 2-methyl-2-pentenal and the dichromate led to a runaway reaction and eruption of the reactor contents, [J. Haz. Mat., 1987, 233-239].

Health Hazard

Inhalation of dust or mist causes respiratory irritation sometimes resembling asthma; nasal septal perforation may occur. Ingestion causes vomiting, diarrhea, and (rarely) stomach and kidney complications. Contact with eyes or skin produces local irritation; repeated skin exposure causes dermatitis.

Fire Hazard

Behavior in Fire: Decomposes to produce oxygen when heated. May ignite other combustibles upon contact.

Safety Profile

Confirmed carcinogen with experimental tumorigenic data. Poison by ingestion, sktn contact, intravenous, intraperitoneal, and subcutaneous routes. Human systemic effects by ingestion: cough, nausea or vomiting, and sweating. Human mutation data reported. A caustic and irritant. A powerful oxidizer. Potentially explosive reaction with acetic anhydride, ethanol + sulfuric acid + heat, hydrazine. Violent reaction or ignition with boron + shcon (pyrotechnic), organic residues + sulfuric acid, 2-propanol + sulfuric acid, sulfuric acid + trinitrotoluene. Incompatible with hydroxylamine. When heated to decomposition it emits toxic fumes of Na2O. See also CHROMIUM COMPOUNDS.

Potential Exposure

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.

Shipping

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.

Incompatibilities

Aqueous solution in a base. A strong oxidizer. Violent reaction with reducing agents; combustibles, strong acids; organic materials.

SODIUM DICHROMATE(10588-01-9)Related Product Information

• Sodium chromate
• Sodium dichromate dihydrate
• Sodium oxide
• Disodium hydrogen phosphate dihydrate
• SODIUM PHOSPHATE, DIBASIC, HEPTAHYDRATE
• Sodium sulfide
• N-(Isoxazol-5-yl)sulphanilamide
• Sodium bromide
• Sodium Phosphate, Dibasic
• Ammonium dichromate
• Sodium chromate tetrahydrate
• Viridian 3B
• CHROMIUM (III) OXIDE HYDRATE
• Chromic acid
• Chromium
• chromium dioxide
• SODIUM DICHROMATE
• SODIUMCHROMITE