Solid phase
Official name
Oxovanadium(2+) sulfate pentahydrate
Secondary names
Vanadyl sulfate pentahydrate; Oxosulfatovanadium pentahydrate; Vanadium, oxosulfato-, pentahydrate; vanadic sulfate pentahydrate
CAS number
12439-96-2
Type
Family
ionic solid
Class
alkali salt
Compound type
sulfate
Comments
also exists as anhydrate (Pauflerite), trihydrate (Bobjonesite) and hexahydrate (Stanleyite)
Chemical composition
Formula
$VOSO_4 \bullet 5(H_2O)$
Chemical formula
VOSO4•5H2O
Elemental formula
(V2+) O8 S (O-)2 H10
Isotope mixture type
terrestrial abundance
16.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$V^{2+}$ Vanadium(II) cation element 1 0.125 1 constituent cation main
$O$ Oxygen element 1 0.125 1 constituent element main
$SO_4^{2-}$ Sulfate ion molecule 1 0.125 1 molecular ion main
$H_2O$ Water molecule 5 0.625 1 hydration main
Composition comments
one H2O molecule is not bonded with the V ion
Chemical functions
  Function Number
$(SO_4)^{2-}$ 2
$R-OH$ 2
Chemical bonds
  Bond Number
$V-O$ 4
$\cdot (cdot) V^{2+}=O$ 1
$\cdot V^{2+} \cdot O^{-}-$ 1
$-\gg S-O^{-}$ 2
$\geqq S=O$ 2
$-O-H$ 2
$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$ 4
Class
alkali salts (06)
Type
simple alkali salts (06.01)
Phase type
crystalline
Crystal system
unknown
Molar mass
253.07 $g/mol$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid decomposition > 105°C (> 378 K)
solid-solid hexahydrate $VOSO_4(H_2O)_6$ < 13.6 °C (< 286.8 K)
Pure color
blue
Color
blue
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