Solid phase
Official name
Ammonium heptamolybdate tetrahydrate
Secondary names
Ammonium docosaoxoheptamolybdate(6–) tetrahydrate
CAS number
12054-85-2
Type
Family
ionic solid
Class
alkali salt
Compound type
molybdate
Chemical composition
Formula
$(NH_4^+)_6 \cdot (Mo_7O_{24})^{-6} \bullet 4(H_2O)$
Chemical formula
(NH4)6.Mo7O24•4H2O
Elemental formula
(N+)6 H32 Mo7 O22 (O+)2 (O2+)2 (O-)12
Isotope mixture type
terrestrial abundance
22.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$NH_4^+$ Ammonium ion molecule 6 0.5454545454545454 1 molecular ion main
$[Mo_7O_24]^{6-}$ Heptamolybdate hexaanion molecule 1 0.09090909090909091 1 molecular ion main
$H_2O$ Water molecule 4 0.36363636363636365 1 hydration main
Chemical functions
  Function Number
$H_4 >\mid N^+$ 6
$R-OH$ 2
Chemical bonds
  Bond Number
$>\mid N^+ \cdot O^{-}-$ 6
$\geq N^+-H$ 4
$\geq \mid Mo-O-$ 36
$\geq \mid Mo-O^{+}<$ 6
$\geq \mid Mo-O^{2+} \mid -$ 8
$\geq \mid Mo-O^-$ 12
$-O-H$ 2
Class
alkali salts (06)
Type
simple alkali salts (06.01)
Phase type
crystalline
Molar mass
1235.86 $g/mol$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid anhydrous liquid phase > ~90°C (> ~363 K)
Pure color
colorless
Color
colorless, white
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