AMMONIUM CHROMATE

AMMONIUM CHROMATE Basic information
Product Name:AMMONIUM CHROMATE
Synonyms:ammoniumchromate(vi);chromicacid(h2cro4),diammoniumsalt;chromicacid[h2cro4],diammoniumsalt;diammoniumchromate;neutralammoniumchromate;AMMONIUM CHROMATE;Ammonium chronate;AmmoniumDichromate,>99%
CAS:7788-98-9
MF:CrH8N2O4
MW:152.07
EINECS:232-138-4
Product Categories:Ammonium Salts;Metal and Ceramic Science;Salts;Inorganic Chemicals
Mol File:7788-98-9.mol
AMMONIUM CHROMATE Structure
AMMONIUM CHROMATE Chemical Properties
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 Gravity1.91
color Yellow-orange
Water Solubility Soluble in water. Slightly soluble in liquid ammonia, acetone, methanol. Insoluble in ethanol.
Merck 14,510
Exposure limitsACGIH: 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 Reference7788-98-9(CAS DataBase Reference)
EPA Substance Registry SystemAmmonium chromate (7788-98-9)
Safety Information
Hazard Codes O,T,N
Risk Statements 49-8-43-50/53-34
Safety Statements 53-17-45-60-61-36/37/39-26
RIDADR UN 1479 5.1/PG 2
WGK Germany 3
RTECS GB2880000
TSCA Yes
HazardClass 5.1
PackingGroup III
Hazardous Substances Data7788-98-9(Hazardous Substances Data)
MSDS Information
ProviderLanguage
SigmaAldrichEnglish
ALFAEnglish
AMMONIUM CHROMATE Usage And Synthesis
Chemical PropertiesAmmonium chromate is a yellow crystalline compound which can be used in solution, which is yellow with an ammonia odor.
UsesSensitizing gelatin in photography, in textile printing pastes, in fixing chromate dyes on wool, and as a reagent in analytical chemistry.
UsesAmmonium 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.
UsesReagent for the preparation of a solid heterogeneous oxidizing agent for liquid phase oxidation of alcohols.
HazardToxic by inhalation, strong irritant. Con- firmed carcinogen.
Safety ProfileA 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 ExposureIt is used to inhibit corrosion and in dyeing, photography and many chemical reactions. Used as a fungicide and fire retardant.
ShippingUN3288 Toxic solids, inorganic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required.
Purification MethodsCrystallise it from weak aqueous ammonia (ca 2.5mL/g) by cooling from room temperature. It loses NH3 on heating to form ammonium dichromate. POISONOUS.
IncompatibilitiesA 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 DisposalConsult 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.
AMMONIUM CHROMATE Preparation Products And Raw materials
Raw materialsAmmonia–>Chromium(VI) oxide–>Potassium sulfate–>Potassium chromate–>Ammonium dichromate
Preparation ProductsFurfuryl alcohol

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