Solid phase
Official name
Cobalt(II) nitrate hexahydrate
Secondary names
Cobaltous nitrate hexahydrate; Nitric acid, cobalt(2+) salt hexahydrate
CAS number
10026-22-9
Type
Family
ionic solid
Class
normal salt
Compound type
nitrate
Chemical composition
Formula
$Co^{2+}.(NO_3^-)_2 \bullet 6H_2O$
Chemical formula
Co(N03)2.6H2O
Elemental formula
(Co2+) (N+)2 O8 (O-)4 H12
Isotope mixture type
terrestrial abundance
18.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Co^{2+}$ Cobaltous cation element 1 0.1111111111111111 1 constituent cation main
$(NO_3)^-$ Nitrate anion chemical function 2 0.2222222222222222 1 anionic radical main
$H_2O$ Water molecule 6 0.6666666666666666 1 hydration main
Composition comments
better described as hexaaquacobalt(II) nitrate, [Co(OH_2)_6]^{2+}[NO_3]^-_2
Chemical functions
  Function Number
$(NO_3)^-$ 2
$R-OH$ 2
Chemical bonds
  Bond Number
$\cdot Co^{2+} \cdot O^{-}-$ 2
$-O-H$ 2
$\dddot - \dddot - N^+ \dddot - O^{-2/3}$ 3
Class
normal salts (07)
Type
hydrated simple normal salts (07.04)
Phase type
crystalline
Crystal system
monoclinic
Comments
consists of discrete $[Co(OH_2)6]^{2+} and [NO_3]^−$ ions
Molar mass
291.03 $g/mol$
Density
1.88 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid 328K (55°C)
Phase transitions comments
decompose at 347K (74°C)
Refringence type
biaxial
Refraction index $n_{\alpha}$
1.52
Pure color
red
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