Solid phase
Official name
Ammonium vanadium sulfate
Secondary names
Ammonium vanadium(III) sulfate; Azanium;vanadium;disulfate; Vanadium-ammonium alum
CAS number
22723-49-5
Type
Family
ionic solid
Class
mixed salt
Compound type
sulfate
Comments
there is a cubic dodecahydrate phase (1.69g/cm3) melting at 45°C
Chemical composition
Formula
$[NH_4]^+[V]^{3+} \cdot (SO_4)^{2-}_2$
Chemical formula
NH4V.(SO4)2
Elemental formula
(N+) H4 (V3+) S2 O4 (O-)4
Isotope mixture type
terrestrial abundance
8.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$NH_4^+$ Ammonium ion molecule 1 0.25 1 molecular ion main
$V^{3+}$ Vanadium(III) cation element 1 0.25 1 constituent cation main
$SO_4^{2-}$ Sulfate ion molecule 2 0.5 1 molecular ion main
Chemical functions
  Function Number
$H_4 >\mid N^+$ 1
$(SO_4)^{2-}$ 2
Chemical bonds
  Bond Number
$>\mid N^+ \cdot O^{-}-$ 2
$\cdot (\cdot) V^{3+} \cdot O^{-}-$ 2
$\geq N^+-H$ 4
$-\gg S-O^{-}$ 2
$\geqq S=O$ 2
$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$ 4
Class
mixed salts (08)
Type
double mixed salts (08.02)
Phase type
crystalline
Crystal system
unknown
Molar mass
261.103 $g/mol$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid decomposition > 300°C (> 573 K)
Pure color
dark-red
Color
dark-red, dark-violet, black
Diaphaneity
opaque
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