Potassium chromate

Not to be confused with Potassium dichromate.

Potassium chromate
IUPAC name Potassium chromate
Other names Chromic acid, (K2CrO4), dipotassium salt
Identifiers
CAS number	7789-00-6 Y
PubChem	24597
EC number	232-140-5
RTECS number	GB2940000
Properties
Molecular formula	CrK2O4
Molar mass	194.19 g mol−1
Appearance	Yellow odorless powder
Odor	odorless
Density	2.7320 g/cm3
Melting point	968 °C, 1241 K, 1774 °F
Boiling point	1000 °C, 1273 K, 1832 °F
Solubility in water	63 g/100 mL (20 °C)
Solubility	insoluble in alcohol
Hazards
MSDS	Chemical Safety Data
EU Index	024-006-00-8
EU classification	Carc. Cat. 2 Muta. Cat. 2 Toxic (T) Irritant (Xi) Dangerous for the environment (N)
R-phrases	R49, R46, R36/37/38, R43, R50/53
S-phrases	S53, S45, S60, S61
NFPA 704	0 3 1 OX
Related compounds
Other anions	Potassium dichromate Potassium molybdate Potassium tungstate
Other cations	Sodium chromate Calcium chromate Barium chromate
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Potassium chromate (K₂CrO₄) is a yellow chemical indicator used for identifying concentrations of chloride ions in a salt solution with silver nitrate (AgNO₃). It is a class two carcinogen and can cause cancer on inhalation.

General information

Physical properties

Potassium Chromate is a lemon yellow compound that is in the form of a crystalline solid, and it is very stable.^{[citation needed]}

Reactions

When reacted with lead(II) nitrate, it creates an orange-yellow precipitate, lead(II) chromate. All ions hydrolyze in solution^{[citation needed]}.

Occurrence

Tarapacaite is the natural, mineral form of potassium chromate. It occurs very rarely and until now is known from only few localities on Atacama desert.^{[citation needed]}

Safety

Potassium chromate is very toxic and may be fatal if swallowed. It may also act as a carcinogen, and can create reproductive defects if inhaled or swallowed. It also is a strong oxidizing agent if in the presence of H⁺ to produce the dichromate ion. It may react rapidly, or violently. It is also possible that it may react explosively with other reducing agents and flammable objects.