Solid phase
Official name
Potassium bromide
Secondary names
KBr
CAS number
7758-02-3
Type
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 bonds
  Bond Number
$K^+ \cdot Br^-$ 1
Class
normal salts (07)
Type
simple normal salts (07.01)
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
hexoctahedral
Crystal class symbol
m-3m (Oh)
Crystal spacegroup
Fm-3m
Molar mass
119.002 $g/mol$
Density
2.74 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid KBr 1007 K (734°C)
Refringence type
isotropic
Refraction index $n_{\alpha}$
1.560
Pure color
colorless
Color
colorless, white
Diaphaneity
transparent to translucent
Luster
vitreous
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