Solid phase
Official name
Cobalt(II) sulfate heptahydrate
Secondary names
Cobalt(II) sulphate heptahydrate; Chalcanthum; Blue vitriol
CAS number
10026-24-1
Type
Family
ionic solid
Class
normal salt
Compound type
sulfate
Chemical composition
Formula
$Co^{2+} \cdot SO_4^{2-} \bullet 7(H_2O)$
Chemical formula
CoSO4•7(H2O)
Elemental formula
(Co2+) S O9 (O-)2 H14
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
$(SO_4)^{2-}$ Sulfate anion chemical function 1 0.1111111111111111 1 anionic radical main
$H_2O$ Water molecule 7 0.7777777777777778 1 hydration main
Chemical functions
  Function Number
$(SO_4)^{2-}$ 1
$R-OH$ 2
Chemical bonds
  Bond Number
$\cdot Co^{2+} \cdot O^{-}-$ 2
$-O \dots H-$ 7
$-O-H$ 2
$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$ 4
Class
normal salts (07)
Type
hydrated simple normal salts (07.04)
Group
sulfate (07.01.09)
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
P2(1)/c
Molar mass
281.103 $g/mol$
Density
1.948 $g/cm^3$
State NTP
solid
Refringence type
biaxial
Refringence sign
unknown
Refraction index $n_{\alpha}$
1.483
Color
Red
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