yellow to orange powder
Lead chromate is found naturally in minerals crocoite and phoenicochroite. It also is readily prepared by adding a soluble chromate such as sodium or potassium chromate to a solution of lead nitrate, lead acetate or other soluble lead(II) salt in neutral or slightly acidic solution:
Pb2+ + CrO42¯ → PbCrO4
The yellow precipitate is filtered, washed and dried.
Pigment for paints and inks; in oil and water colors; printing fabrics, decorating china and porcelain; in chemical analysis of organic substances; in traffic paints.
It is used in chemical analysis of organic substances.
ChEBI: A chromium coordination entity comprising chromate and lead(2+) ions in a 1:1 ratio
Occurrence and Uses
Lead chromate occurs in nature as the minerals, crocoite and phoenicochroite. It is an important pigment of lead used in oil paints and water colors. It is used for printing textiles and coloring porcelain.
Moderately toxic by intraperitoneal route. The effects, however, are mild from oral intake. Occupational exposure may cause cancer. There is sufficient evidence of carcinogenicity in animals and humans.
Yellow monoclinic crystals; refractive index 2.31; density 6.12 g/cm3; melts at 844°C; decomposes on further heating; insoluble in water; also insoluble in ammonia and acetic acid; soluble in acids and alkalies.