Selenious Acid USP
Selenious acid is the chemical compound with the formula H2SeO3. Structurally, it is more accurately described by (HO)2SeO. It is the principal oxoacid of selenium; the other being selenic acid.
Selenious acid is used in changing the color of steel, especially the steel in guns, the so-called “bluing” process which uses selenous acid, copper(II) nitrate, and nitric acid to change the color of the steel from silver-grey to blue-grey. Another use for selenious acid is the chemical darkening and patination of copper, brass and bronze, producing a rich dark brown color that can be further enhanced with mechanical abrasion.
Chemical Name: Selenious Acid
Mol. Formula: H2SeO3
Mol. Weight: 128.97g/mol
CAS No.: 7783-00-8
|Appearance||White hygroscopic crystals|
|Solubility||Very Soluble in Water and soluble in ethanol|
|Residue on Ignition||Maximum 0.01%|
|Insoluble matter||Dissolve 1 g in 5 mL of water: it dissolves completely and the solution is clear.|
|Selenate and sulfate||Specified test. no turbidity or precipitate is formed in 10 minutes|
|Organic volatile impurities||Passes test|
|Residual solvents||Passes test|
|Assay||Not less than 93% and not more than 101% of H2SeO3|
Shelf life, Storage and Packing
It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.
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We observe WHO Good manufacturing practice and Good laboratory practice.