Nomenclature
CAS number: 10101-53-8
Sulfuric acid chromium(3+) salt (3:2); chromium(III) sulfate.
Cr
2O
12S
3; mol wt 392.18.
Cr 26.52%, O 48.96%, S 24.53%.
Cr
2(SO
4)
3.
Description and references
Prepn of anhydr salt by dehydration of hydrated
forms: Rollinson, Bailar, Jr., Inorg. Synth. 2, 197 (1946). Toxicity data: Cavalli, Arch. Int. Pharmacodyn. 62, 330
(1939).
Properties
Peach-colored solid. d 3.012. Practically insol in water and acids.
MLD in frogs, mice, rabbits (mg/kg): 37, 246.8, 215 i.v. (Cavalli).Derivative
Hydrates.
Properties
Are known in both green and violet modifications,
and have several degrees of hydration up to 18H2O: Lukaszewski,
Redfern, Nature 190, 805 (1961); Udy in Chromium vol. 1, M. J. Udy, Ed., A.C.S. Monograph Series no. 132 (Reinhold, New York, 1956) pp 213-217, 288. The technical product
comes in the form of a finely granular, dark-green flake or powder
approximating the formula Cr2(SO4)3.10H2O. Readily sol in water. Almost insol in alc.Derivative
Basic chromic sulfates.
Properties
Of the type Cr(OH)SO4.nH2O are of importance in the tanning industry: Udy, loc.
cit. and pp 278-280, 305-308. Technical grades are available
in two degrees of basicity, one-third and one-half, as finely granular
dark-green flakes or powder contg about 25% Cr2O3. Readily sol in water.Use
Insolubilization of gelatin; in catalyst prepn;
as mordant in textile industry; in tanning of leather; in chrome plating;
in manuf of Cr, CrO
3, and Cr alloys; to improve dispersibility
of vinyl polymers in water; in manuf of green varnishes, paints, inks,
glazes for porcelain.