SILVER CHROMATE

Synonym(s):Chromic acid, disilver(I)salt

CAS NO.：7784-01-2
Empirical Formula: AgCrH2O4
Molecular Weight: 225.88
MDL number: MFCD00003402
EINECS: 232-043-8
SAFETY DATA SHEET (SDS)
Update Date: 2023-05-09 09:30:55

What is SILVER CHROMATE?

Chemical properties

crystalline powder

Physical properties

Red monoclinic crystals or brownish-red powder; density 5.625 g/cm³; insoluble in water; soluble in nitric acid, ammonia and solutions of alkali cyanides and chromates.

The Uses of SILVER CHROMATE

Catalyst for formation of aldol from alcohol; formed at end point of Mohr titration of halides.

Preparation

Silver chromate is prepared by slowly adding a solution of potassium chromate to a solution of silver nitrate:
2Ag+ (aq) + Cr₄O^2- (aq) → Ag₂CrO₄ (s)
The precipitate is washed with hot water.

Purification Methods

Wash the red-brown powder with H2O, dry it in a vacuum, then powder well and dry again in a vacuum at 90o/5hours. Its solubility in H2O is 0.0014% at 10o. Store it in the dark. [Cardillo & Shimizu J Org Chem 42 4268 1977.]

Properties of SILVER CHROMATE

Density	5.625 g/mL at 25 °C (lit.)
form	Powder
Specific Gravity	5.625
color	Red-brown
Water Solubility	Slightly soluble in water. Soluble in HNO<sub>3</sub> and ammonia
Sensitive	Light Sensitive
Merck	14,8510
Solubility Product Constant (Ksp)	pKsp: 11.95
Exposure limits	OSHA: Ceiling 0.1 mg/m3 NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3
Stability:	Stable. but light-sensitive and hygroscopic.
CAS DataBase Reference	7784-01-2(CAS DataBase Reference)
EPA Substance Registry System	Chromic acid (H2CrO4), disilver(1+) salt (7784-01-2)

Safety information for SILVER CHROMATE

Signal word	Danger
Pictogram(s)	Flame Over Circle Oxidizers GHS03 Exclamation Mark Irritant GHS07 Health Hazard GHS08 Environment GHS09
GHS Hazard Statements	H272:Oxidising liquids;Oxidising solids H317:Sensitisation, Skin H350:Carcinogenicity H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P201:Obtain special instructions before use. P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P308+P313:IF exposed or concerned: Get medical advice/attention.