2228. Chromic Potassium Oxalate

Nomenclature

CAS number: 14217-01-7
Potassium (OC-6-11)-tris[ethanedioato(2-)-κO1,κO2]chromate(3-) (3:1); tripotassium tris(ethanedioato)chromate(3-); tripotassium tris(oxalato)chromate(3-); potassium trioxalatochromate(III); potassium chromic oxalate.
C6CrK3O12; mol wt 433.35.
C 16.63%, Cr 12.00%, K 27.07%, O 44.30%.
K3[Cr(C2O4)3].

Description and references

Prepd by treatment of oxalic acid and K2C2O4 with K2Cr2O7: Bailar, Jr., Jones, Inorg. Synth. 1, 37 (1939); Hein, Herzog in Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1372.

Derivative

Trihydrate.

Nomenclature

CAS number: 15275-09-9
Potassium trioxalatotriaquochromate(III).
C6CrK3O12.3H2O; mol wt 487.39.
C 14.79%, Cr 10.67%, K 24.07%, O 49.24%, H 1.24%.

Properties

Black-green, monoclinic scales with transparent blue edges. Freely sol in water; practically insol in alcohol.

Use

In tanning industry; dyeing chromate colors on wool.