AMMONIUM CHROMATE

Synonym(s):Chromic acid ammonium salt

CAS NO.：7788-98-9
Empirical Formula: CrH8N2O4
Molecular Weight: 152.07
MDL number: MFCD00015958
EINECS: 232-138-4
SAFETY DATA SHEET (SDS)
Update Date: 2023-04-23 13:52:06

What is AMMONIUM CHROMATE?

Chemical properties

Ammonium chromate is a yellow crystalline compound which can be used in solution, which is yellow with an ammonia odor.

The Uses of AMMONIUM CHROMATE

Ammonium chromate, is used in photography as a sensitizer for gelatin coatings. It's often used in photography, textile printing, and fixing chromate dyes on wool. It is also used as an analytical reagent, catalyst.

The Uses of AMMONIUM CHROMATE

Sensitizing gelatin in photography, in textile printing pastes, in fixing chromate dyes on wool, and as a reagent in analytical chemistry.

The Uses of AMMONIUM CHROMATE

Reagent for the preparation of a solid heterogeneous oxidizing agent for liquid phase oxidation of alcohols.

Hazard

Toxic by inhalation, strong irritant. Con- firmed carcinogen.

Safety Profile

A poison. Mutation data reported. See also CHROMIUM COMPOUNDS. A powerful oxidizer. An explosion hazard when shocked or heated. When heated to decomposition it emits toxic fumes of NH3, Cr03, and NOx. Incompatible with reducing agents.

Potential Exposure

It is used to inhibit corrosion and in dyeing, photography and many chemical reactions. Used as a fungicide and fire retardant.

Shipping

UN3288 Toxic solids, inorganic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required.

Purification Methods

Crystallise it from weak aqueous ammonia (ca 2.5mL/g) by cooling from room temperature. It loses NH3 on heating to form ammonium dichromate. POISONOUS.

Incompatibilities

A strong oxidizer and an explosive. Contact with combustible, organic and other readily oxidizable substances may cause fire and explosions. Hydrazine, other reducing agents. Corrosive to metals.

Waste Disposal

Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal. Addition of a large volume of a reducing agent solution (hypo, bisulfite or ferrous salt, and acidify with 3 M sulfuric acid). When reduction is complete, flush to drain with large volumes of water.

Properties of AMMONIUM CHROMATE

Melting point:	180°C (dec.)
Density	1.91 g/mL at 25 °C (lit.)
solubility	H₂O: 1 M at 20 °C, clear, yellow
form	Crystalline
Specific Gravity	1.91
color	Yellow-orange
Water Solubility	Soluble in water. Slightly soluble in liquid ammonia, acetone, methanol. Insoluble in ethanol.
Merck	14,510
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
CAS DataBase Reference	7788-98-9(CAS DataBase Reference)
EPA Substance Registry System	Ammonium chromate (7788-98-9)

Safety information for AMMONIUM CHROMATE

Signal word	Danger
Pictogram(s)	Flame Over Circle Oxidizers GHS03 Corrosion Corrosives GHS05 Health Hazard GHS08 Environment GHS09
GHS Hazard Statements	H272:Oxidising liquids;Oxidising solids H314:Skin corrosion/irritation H334:Sensitisation, respiratory H350:Carcinogenicity H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P260:Do not breathe dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.