2247. Chromous Sulfate

Nomenclature

CAS number: 13825-86-0
CrO4S; mol wt 148.06.
Cr 35.12%, O 43.22%, S 21.66%.
CrSO4.

Description and references

Prepn of pentahydrate: Lux, Illman, Ber. 91, 2143 (1958); Holah, Fackler, Inorg. Synth. 10, 26 (1967). The common hydrated form, long considered to be the heptahydrate, has been reported to be the pentahydrate: Lux, Illman, loc. cit.; Lux et al., Ber. 97, 503 (1964). Prepn of standard soln for use as an analytical reagent: Lingane, Pecsok, Anal. Chem. 20, 425 (1948).

Derivative

Pentahydrate.

Properties

Blue crystals. Stable in air if dry. Sol in water; slightly sol in alcohol; practically insol in acetone. Soluble in dil, dec by concd H2SO4. Solns are rapidly oxidized by atmospheric oxygen.

Use

Analytical reagent; absorption of O2 from gas mixtures; dehydrohalogenating and reducing agent.