Sodium Selenite also known as a Disodium salt of Selenious Acid is a white solid, highly soluble in water, solubility in water : about 85 gms /100ml @ 20°c., but not soluble in ethanol. It has the Mol. Formula Na2SeO3 with Selenium having (+4 )oxidation state. It is prepared by the action of Sodium Hydroxide (NaOH) on Selenious Acid ( H2SeO3). Sodium Selenite is available in two forms as given below: i)The Anhydrous form :As Na2 SeO3, Mol. Wt.: 172.94 gms/mole, CAS No. 10102-18-8 ii) The Hydrous form : As Na2 SeO3.5 H2O known as Sodium Selenite Penta hydrate Mol. Wt.: 263.01gms/mole , CAS No. 26970-82-1 Both these forms behave identically, except that they differ in their Molecular wt. Sodium Selenite finds its application in the Glass Manufacturing Industries for manufacturing colorless glass. It is also used in the preparation of Sodium Selenate.
Specifications - Sodium Selenite
|Description||White to off white crystalline powder..|
|Iron||Max. 0.005 %|
|Sulphate||Max. 0. 20%|
|Loss on drying||Max. 0.50%|