Sodium selenite | SSHADE

Processing math: 50%

Solid phase

Official name: Sodium selenite

Name and identifiers

Secondary names: Se(IV) sodium selenite; Disodium selenite; Selenious acid, disodium salt
CAS number: 10102-18-8

Family: ionic solid
Class: alkali salt
Compound type: selenite

Chemical composition

Formula: $(Na^+)_2 \cdot SeO_3^{2-}$
Chemical formula: Na2SeO3
Elemental formula: (Na+)2 Se O (O-)2
Isotope mixture type: terrestrial abundance

6.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Na^+$	Sodium cation	element	2	0.6666666666666666	1	constituent cation	main
	$SeO_3^{2-}$	Selenite ion	molecule	1	0.3333333333333333	1	constituent anion	main

Chemical functions and bonds

Chemical bonds

	Bond	Number
	$Na^+ \cdot O^{-}-$	2
	$\eqslantgtr Se-O^{-}$	2
	$>Se=O$	1

Class: alkali salts (06)
Type: simple alkali salts (06.01)

Crystallography

Phase type: crystalline
Crystal system: tetragonal

Physical properties

Molar mass: 172.95 $g/mol$
Density: 3.1 $g/cm^3$

Thermodynamical properties

State NTP: solid
Phase transitions comments: decompose at 320°C

Optical properties

Refringence type: uniaxial
Pure color: colorless
Color: white

Links and Publications

Links

Wikipedia: Sodium selenite