| Identification | Back Directory | [Name]
chromous sulfate | [CAS]
13825-86-0 | [Synonyms]
chromous sulfate
Chromium(II) sulfate
Sulfuric acid chromium(II) salt | [Molecular Formula]
CrO4S | [MOL File]
13825-86-0.mol | [Molecular Weight]
150.07 |
| Chemical Properties | Back Directory | [Appearance]
(Pentahydrate) Blue crystals. Soluble in
water; insoluble in acetone; slightly soluble in alcohol. Solutions are subject to atmospheric oxidation. | [solubility ]
soluble in dilute acid solutions; slightly soluble in ethanol;
insoluble in acetone | [form ]
blue crystals | [color ]
blue crystals, crystalline | [Water Solubility ]
soluble H2O; soluble dilute H2SO4, decomposed by conc H2SO4 [MER06] | [Uses]
Oxygen scavenger, reducing agent, analytical
reagent. | [CAS DataBase Reference]
13825-86-0 |
| Hazard Information | Back Directory | [Chemical Properties]
(Pentahydrate) Blue crystals. Soluble in
water; insoluble in acetone; slightly soluble in alcohol. Solutions are subject to atmospheric oxidation. | [Synthesis]
The most common procedure for preparing an aqueous chromous sulfate solution employs a reduction of Cr2(SO4)3 with mossy Zn and Hg in water and is used as is. Alternate syntheses start with very pure Cr metal5 or K2Cr2O7. A method for preparing crystalline blue CrSO4.5H2O has been published.
| [Precautions]
Aqueous CrSO4 solutions are stable at temperatures between 20 and 60 °C for several days if stored in an oxygen-free environment. The aqueous solution should be stored in a vented container as the powerful reducing agent will reduce water and, over time, liberate hydrogen gas, which may lead to an explosion. Rigorously dried CrSO4.5H2O can be stored in the presence of air for at least eight months. However, it degrades quickly in the presence of oxygen if it is finely ground.
|
|
|