SILVER CHROMATE Property

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 HNO₃ 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

Hazard Codes 

O,T,N

Risk Statements 

8-43-49-50/53

Safety Statements 

17-45-53-61-60

RIDADR 

3087

WGK Germany 

3

TSCA 

Yes

HazardClass 

5.1

PackingGroup 

III

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H272May intensify fire; oxidizer

H317May cause an allergic skin reaction

H350May cause cancer

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P201Obtain special instructions before use.

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P308+P313IF exposed or concerned: Get medical advice/attention.

SILVER CHROMATE Chemical Properties,Usage,Production

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.

Uses

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.]