Sodium chromate tetrahydrate Chemical Properties

Melting point:

792℃

Density 

2.73

solubility 

slightly soluble in ethanol

form 

Crystals

color 

Yellow

PH

pH (10g/l, 25℃) : 8.0～10.0

Odor

Odorless

Water Solubility 

Soluble in water.

Sensitive 

Hygroscopic

Merck 

14,8601

Exposure limits

ACGIH: TWA 0.0002 mg/m3; STEL 0.0005 mg/m3 (Skin)
OSHA: Ceiling 0.1 mg/m3
NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3

Stability:

Stable. Incompatible with strong reducing agents, combustible materials, strong acids. Deliquescent.

CAS DataBase Reference

10034-82-9(CAS DataBase Reference)

EPA Substance Registry System

Sodium chromate(VI), tetrahydrate (10034-82-9)

Safety Information

Hazard Codes 

T+,N

Risk Statements 

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

Safety Statements 

53-45-60-61

RIDADR 

UN 3288 6.1/PG 2

WGK Germany 

3

RTECS 

GB2958300

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

II

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

Sodium chromate tetrahydrate Usage And Synthesis

Chemical Properties

yellow deliquescent crystals

Chemical Properties

Sodium cyanide is found as white granules, flakes or lumps. Sodium cyanide is shipped as pellets or briquettes. Odorless when dry. It absorbs water from air (is hygroscopic or deliquescent). Hydrogen cyanide gas released by sodium cyanide has a distinctive mild, bitter almond odor, but a large proportion of people cannot detect it; the odor does not provide adequate warning of hazardous concentrations.

Chemical Properties

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

Uses

Corrosion inhibitor, pigment manufactureSodium chromate tetrahydrate is used as a corrosion inhibitor, wood preservative and an auxiliary in textile industry. It serves as an oxidant, which is used to prepare carboxylic acids and ketones from primary and secondary alcohols respectively. Further, it is used as a starting material to prepare other chromium compounds and as a catalyst in organic synthesis especially pharmaceuticals and agro chemicals.

Uses

Sodium chromate tetrahydrate can be used as an oxidant in organic synthesis and also as a carrier electrolyte in the capillary electrophoresis.

General Description

Odorless bright yellow deliquescent crystals. Aqueous solutions are alkaline.

Air & Water Reactions

Deliquescent. Water soluble.

Reactivity Profile

Sodium chromate tetrahydrate is a strong oxidizing agent. Incompatible with strong acids . Contact with combustible materials may lead to a fire. Toxic chromium oxide fumes may form in fire [USCG, 1999].

Fire Hazard

Literature sources indicate that Sodium chromate tetrahydrate is nonflammable.

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.

Purification Methods

Crystallise the chromate from hot water (0.8mL/g). It is deliquescent.

Incompatibilities

Sodium cyanide decomposes on contact with acids, acid salts, water, moisture, alcohols, and carbon dioxide, releasing highly toxic and flammable hydrogen cyanide gas. Aqueous solution is a strong base; it reacts violently with acid and is corrosive. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Absorbs moisture from the air forming a corrosive syrup. Corrosive to active metals, such as aluminum, copper, and zinc. Under acid conditions, sarin hydrolyzes to form hydrofluoric acid.

Waste Disposal

Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposal. In accordance with 40CFR165, follow recommendations for the disposal of pesticides and pesticide containers. Must be disposed properly by following package label directions or by contacting your local or federal environmental control agency, or by contacting your regional EPA office. Add strong alkaline hypochlorite and react for 24 hours. Then flush to sewer with large volumes of water.

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