Ammonium heptamolybdate tetrahydrate | SSHADE

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Solid phase

Official name: Ammonium heptamolybdate tetrahydrate

Name and identifiers

Secondary names: Ammonium docosaoxoheptamolybdate(6–) tetrahydrate
CAS number: 12054-85-2

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 and bonds

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)

Crystallography

Phase type: crystalline

Physical properties

Molar mass: 1235.86 $g/mol$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-liquid	anhydrous liquid phase	> ~90°C (> ~363 K)

Optical properties

Pure color: colorless
Color: colorless, white

Links and Publications

Links