20638-10-2

Basic information

• Product Name: hydrogen selenite
• Synonyms: hydrogenselenite
• CAS NO: 20638-10-2
• Molecular Formula: HO₃Se
• Molecular Weight: 127.9667
• Mol File: 20638-10-2.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: hydrogen selenite(CAS DataBase Reference)
• NIST Chemistry Reference: hydrogen selenite(20638-10-2)
• EPA Substance Registry System: hydrogen selenite(20638-10-2)

Safety Data

• Hazardous Substances Data: 20638-10-2(Hazardous Substances Data)

Upstream product

• 7446-08-4 selenium(IV) oxide 
• 7732-18-5 water 
• 7782-82-3 sodium hydrogen selenite 

Downstream Products

• 7782-49-2 selenium 
• 7439-96-5 manganese 
• 7732-18-5 water 
• 19229-76-6 iron(III) 
• 20601-83-6 mercury(II) selenide 

Relevant articles and documents

Haloselenate(IV) formation and selenous acid dissociation equilibria in hydrochloric and hydrofluoric acids

Raman spectroscopy has shown that the initial stages of haloselenate(IV) formation equilibria are the same in HF and HCl solutions. The constants K4 and K5, evaluated by quantitative Raman measurements, for HCl solutions are 0.015 (+/- 0.001) L2mol-2 and 0.9 (+/- 0.1)E-5 L2mol-2, respectively.These constants yield the minimum average deviation in normalized molar scattering intensity for the species formed in three regions of the spectra, 690 and 890 cm-1 (SeO stretching) and 100-450 cm-1 (deformation and SeCl stretching).Before the oneset of haloselenate(IV) formation, changes in the SeO stretching band intensities with HX concentrations occur due to repression of ionic dissociation of selenious acid Quantitative Raman measurements yield K1 = 9.8 (+/- 0.3)E-3 mol L-1.Reasons for the high value of this constant, compared to reported values, are discussed.