Potassium bromide | SSHADE

Solid phase

Official name: Potassium bromide

Name and identifiers

Secondary names: KBr
CAS number: 7758-02-3

Family: ionic solid
Class: normal salt
Compound type: bromide
Comments: Not recognized as mineral species. Natural Potassium bromide is regarded as very very unlikely

Chemical composition

Formula: $K^+ \cdot Br^-$
Chemical formula: KBr
Elemental formula: (K+) (Br-)
Isotope mixture type: terrestrial abundance

4.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$K^+$	Potassium(1+) cation	element	1	0.5	1	constituent cation	main
	$Br^-$	Bromide anion	element	1	0.5	1	constituent anion	main

Composition comments: Deliquescent, very soluble in water: 678 g/l (25 °C)

Chemical functions and bonds

Chemical bonds

	Bond	Number
	$K^+ \cdot Br^-$	1

Class: normal salts (07)
Type: simple normal salts (07.01)

Crystallography

Phase type: crystalline
Crystal system: isometric (cubic)
Crystal class: hexoctahedral
Crystal class symbol: m-3m (Oh)
Crystal spacegroup: Fm-3m

Physical properties

Molar mass: 119.002 $g/mol$
Density: 2.74 $g/cm^3$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-liquid	liquid KBr	1007 K (734°C)

Optical properties

Refringence type: isotropic
Refraction index $n_{\alpha}$: 1.560
Pure color: colorless
Color: colorless, white
Diaphaneity: transparent to translucent
Luster: vitreous

Links and Publications

Links

Wikipedia: Potassium bromide