Ammonium molybdate tetrahydrate

ACS reagent, 81.0-83.0% MoO3 basis

Molybdic acid ammonium salt tetrahydrate, Ammonium heptamolybdate tetrahydrate
Linear Formula:
(NH4)6Mo7O24 · 4H2O
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


ACS reagent


81.0-83.0% MoO3 basis



reaction suitability

reagent type: catalyst
core: molybdenum


≤0.005% Insoluble matter


2.498 g/mL at 25 °C (lit.)

anion traces

arsenate, phosphate, and silicate (as SiO2): ≤0.001%
chloride (Cl-): ≤0.002%
nitrate (NO3-): passes test (limit about 0.003%)
phosphate (PO43-): ≤5 ppm
sulfate (SO42-): ≤0.02%

cation traces

Mg: ≤0.005%
heavy metals: ≤0.001% (by ICP-OES)

storage temp.

room temp

SMILES string




InChI key


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2.5 kg in poly drum
1 kg in poly bottle
100, 500 g in poly bottle


May contain darkened ammonium molybdate crystals that are soluble in water.


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Pradeep Verma et al.
Bioresource technology, 102(4), 3941-3945 (2010-12-24)
Pretreatments for enzymatic saccharification are crucial for the establishment of lignocellulosic biorefineries. In this study, we focused on ammonium ions and peroxometal complexes as potential delignifying agents. We first examined the pretreatment of beech wood with nine different ammonium salts...
Jian Ma et al.
Talanta, 88, 484-489 (2012-01-24)
Determination of silicate at low concentrations (i.e., nanomolar levels) is an important analytical objective for both marine science and the semiconductor industry. Here we report the use of flow injection analysis (FIA) in combination with long pathlength liquid core waveguide...
Kyung Ho Park et al.
Journal of hazardous materials, 138(2), 311-316 (2006-07-25)
The petroleum refining industry makes extensive use of hydroprocessing catalysts. These catalysts contain environmentally critical and economically valuable metals such as Mo, V, Ni and Co. In the present study, a simple hydrometallurgical processing of spent hydrodesulphurization (HDS) catalyst for...
Bernard Lorber et al.
Micron (Oxford, England : 1993), 39(4), 431-446 (2007-05-01)
The formation of 2D arrays of three small icosahedral RNA viruses with known 3D structures (tomato bushy stunt virus, turnip yellow mosaic virus and bromegrass mosaic virus) has been investigated to determine the role of each component of a negative...
Suvarna Sounderajan et al.
Journal of hazardous materials, 149(1), 238-242 (2007-09-01)
Arsenic (V) is known to form heteropolyacid with ammonium molybdate in acidic aqueous solutions, which can be quantitatively extracted into certain organic solvents. In the present work, 12-molybdoarsenic acid extracted in butan-1-ol is used for quantification of As (V). Total...
Objective: To standardize a procedure for the enzymatic determination of Glucose-6-phosphatase activity
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