Ammonium heptamolybdate tetrahydrate 99.8+% extra pure

What is Ammonium Heptamolybdate?

Ammonium heptamolybdate forms colorless crystals that decompose at about 90 °C and release crystal water. It usually forms a tetrahydrate with the chemical formula (NH4)6Mo7O24 4H2O. It is often referred to simply as ammonium molybdate, although ammonium molybdate can also refer to ammonium orthomolybdate (NH4)2MoO4 and other molybdates.

What is Ammonium Heotamolybdate used for?

Ammonium heptamolybdate is used in the laboratory for the detection of silicic acids, phosphoric acid, phosphates, arsenic, lead and sorbitol and for the analysis of seawater. In addition, it is used in a standardized procedure for measuring hydrogen sulfide immission.

After previous treatment of the sample with nitric acid, it forms a yellowish precipitate of molybdenum yellow/ammonium dodecamolybdate phosphate (NH4)3 [P(Mo3O10)4] with phosphates. When ascorbic acid is added as a mild reducing agent, it takes on a strong blue color (formation of molybdenum blue). At lower concentrations of molybdate there is no precipitation, only a change in the color of the solution.

It is also used for the production of catalysts, as a molybdenum fertilizer  and on an industrial scale as an intermediate for the extraction of molybdenum from molybdenum ores.

In biology and biochemistry it is also used in electron microscopy as a contrast agent (negative impression) in a concentration of 3 to 5% by volume, even if trehalose is present in the sample. It is also used in cryo-electron microscopy - in saturated concentrations - as a contrast agent.

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-Technical data

Empirical formula (NH4)6Mo7O24 4 H2O
Molar mass (M) 1235.86 g/mol
Melting point (mp)90 °C
Solubility: 400 g/l (H2O, 20 °C)
WCK 1
CAS No.[12054-85-2]
EC-No. 234-722-4