7783-00-8

Basic information

• Product Name: Selenious(IV) acid
• Synonyms: Monohydrated selenium dioxide;Selenium dioxide,monohydrated;Selenite,hydrogen
• CAS NO: 7783-00-8
• Molecular Formula: H₂O₃Se
• Molecular Weight: 128.97
• EINECS: 231-974-7
• Mol File: 7783-00-8.mol
• Article Data: 9

Chemical Properties

• Melting Point: 70℃
• Boiling Point: 684.9 °C(lit.)
• Flash Point: 690 °C
• Appearance: /
• Density: 4.81 g/mL at 25 °C(lit.)
• Water Solubility: 167 g/100 mL (20℃)
• CAS DataBase Reference: Selenious(IV) acid(CAS DataBase Reference)
• NIST Chemistry Reference: Selenious(IV) acid(7783-00-8)
• EPA Substance Registry System: Selenious(IV) acid(7783-00-8)

Safety Data

• Hazard Codes: T:Toxic;;
• Statements: R23/25:; R33:; R50/53:
• Safety Statements: S20/21:; S28A:; S45:; S60:; S61:
• RIDADR: 3283
• HazardClass: 6.1
• PackingGroup: II
• Hazardous Substances Data: 7783-00-8(Hazardous Substances Data)

Usage

InChI:InChI=1/H2O3Se/c1-4(2)3/h(H2,1,2,3)

Upstream product

• 7782-49-2 selenium 
• 7732-18-5 water 
• 10028-15-6 ozone 
• 7446-08-4 selenium(IV) oxide 
• 7697-37-2 nitric acid 
• 7601-90-3 perchloric acid 
• 7783-08-6 selenic acid 
• 7722-84-1 dihydrogen peroxide 
• 7758-01-2 potassium bromate 
• 10025-68-0 diselenium dichloride 
• 7647-01-0 hydrogenchloride 
• 50981-12-9 sulfuric acid monohydrate 
• 7446-08-4 selenium(IV) oxide 
• 7789-65-3 selenium tetrabromide 

Downstream Products

• 7758-99-8 copper(II) sulfate 
• 7439-96-5 manganese 
• 7782-49-2 selenium 
• 14683-12-6 tellurium 
• 7727-37-9 nitrogen 
• 10025-68-0 diselenium dichloride 
• 7664-93-9 sulfuric acid 
• 141982-42-5 4-(4-hydroxyphenylselanyl)phenol 
• 94783-98-9 o-selenophenol 
• 10026-03-6 selenium tetrachloride 
• 13940-22-2 hydrogen selenide 
• 7488-56-4 selenium disulfide 
• 7446-34-6 selenium sulphide 
• 7732-18-5 water 

Relevant articles and documents

Polymorphism of H2SeO3, NaHSeO4 and Na5H3(SeO4)4(H2O) 2, and re-refinement of the crystal structure of Te2O 4(OH)2

New modifications (denoted as β-) of the compounds H 2SeO3, NaHSeO4, and Na5H 3(SeO4)4(H2O)2 were isolated from aqueous solutions and their crystal structures determined from single crystal data. β-H2SeO3 crystallizes in the space group P1 with lattice parameters of a = 4.6794(4) A, b = 5.0988(4) A, c = 5.7743(5) A, α = 102.252(6)°, β = 91.594(6)°, γ = 98.054(6)°, and consists of two unique trigonal-pyramidal SeO(OH)2 units that are held together by O-H...O hydrogen bonds. β-NaHSeO4 crystallizes in the space group P1 with lattice parameters of a = 5.0814(2) A, b = 5.6345(3) A, c = 6.5125(3) A, α = 88.352(3)°, β = 73.163(3)°, γ = 82.027(3)°, and is made up of distorted NaO 6 octahedra and tetrahedral SeO3(OH)- anions, with the hydrogen atom statistically disordered between two positions. β-Na5H3(SeO4)4(H 2O)2 crystallizes in the space group I2/c with lattice parameters of a = 7.0472(15) A, b = 13.194(3) A, c = 17.845(4) A, β = 101.345(9)°. The asymmetric unit contains three Na + sites (one situated on a twofold rotation axis and each with a distorted octahedral coordination by oxygen atoms), one water molecule, one SeO3(OH)- anion, and half of an [SeO 4...H...O4Se] unit with a very short interpolyhedral O...O distance of 2.447 (4) A. The crystal structures of the β-modifications are comparatively discussed with those of the corresponding known α-modifications. Moreover, the crystal structure of Te2O4(OH)2 was reinvestigated [Pna2 1, a = 12.0512(8) A, b = 8.0267(5) A, c = 4.7268(3) A], allowing the localization of the hydrogen atoms and hence a more detailed view of the hydrogen bonding system. Copyright

Method of producing pharmacologically pure crystals

The present invention relates to means and methods for producing crystals or crystalline substances. In particular, crystals or crystalline substances which are useful as pharmaceutical ingredients can be manufactured.