Ammonium molybdate
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Ammonium molybdate
structure -
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CAS No:
13106-76-8
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Formula:
H8MoN2O4
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Chemical Name:
Ammonium molybdate
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Synonyms:
(beta-4)-molybdate(moo42-diammonium;ammoniummolybdate((nh4)2moo4);ammoniummonomolybdate;diammonium,(T-4)-Molybdate;molybdicacid,diammoniumsalt;AMMoniuM Molybdate, 99.99%, (trace Metal basis);AMMONIUM HEPTAMOLYBDATE TETRAHYDRATE (AM;AMMoniuM Molybdate 99.98% trace Metals basis
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CAS No:
Description
DryPowder; Liquid
Ammonium molybdate is an ammonium salt composed of ammonium and molybdate ions in a 2:1 ratio. It has a role as a poison. It contains a molybdate.
Ammonium molybdate is a colorless, white or slightly greenish-yellow powder. It is used in chemical analysis for the determination of phosphorus. From a nitric acid solution it precipitates phosphorus in the form of ammonium phosphomolybdate having the formula (NH4)3PO4-12MoO3 after drying at 110 °C(230°F). Some of the phosphomolybdic acids are used as reagents for the alkaloids and in the analysis and separation of the alkali metals.
Ammonium molybdate can be prepared by dissolving molybdenum trioxide in ammonia.
Poison by ingestion and intraperitoneal routes. Moderately toxic by other routes. An irritant. See also MOLYBDENUM COMPOUNDS. When heated to decomposition it emits toxic fumes of NH3 and NOx.
Characteristics
81.08000
0.05660
White powder
2.498
170(分解)ºC
Soluble in water, acid and alkali, but insoluble in alcohol.
LD50 orl-rat: 333 mg/kg 28ZLA8 -,214,61
Not classified
Inert atmosphere,Room Temperature
Safety Information
Ⅲ
2811
1
Xi
26-36
QA4900000
Xi
36/37/38
Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides; chemically active metals (such as potassium, sodium, magnesium and zinc) may cause a violent reaction.
Ammonium molybdate Use and Manufacturing
Ammonium orthomolybdate is the inorganic compound with the chemical formula (NH4)2MoO4. It is a white solid that is prepared by treating molybdenum trioxide with aqueous ammonia. Upon heating these solutions, ammonia is lost, to give ammonium heptamolybdate ((NH4)6Mo7O24.4H2O) is obtained. Ammonium orthomolybdate is used as a corrosion inhibitor and is an intermediate in some schemes to win Mo from its ores.
Intermediates
Ammonium molybdate has been used to prepare phosphomolybdates. (NH4)2MoO4 was used as an analytical reagent for quantitative analysis of phosphates, silicates, arsenates and lead in their aqueous solutions. At saturated concentration, (NH4)2MoO4 was used to perform cryo-negative staining and as a negative stain in biological electron microscopy. Ammonium molybdate was used in study of crystallisation of cell-free-expressed membrane proteins.
Pure molybdic oxide (99.95% MoO3) is prepared by sublimation of technical oxide or by calcining ammonium molybdate. Metallic molybdenum powder is prepared commercially by hydrogen reduction of either pure molybdic oxide or ammonium molybdate in a two-step process.
All other basic inorganic chemical manufacturing|Molybdate (MoO42-), ammonium (1:2), (T-4)-: ACTIVE
Computed Properties
Molecular Weight:196.03
Hydrogen Bond Donor Count:2
Hydrogen Bond Acceptor Count:4
Exact Mass:197.953810
Monoisotopic Mass:197.953810
Topological Polar Surface Area:82.3
Heavy Atom Count:7
Complexity:62.2
Covalently-Bonded Unit Count:3
Compound Is Canonicalized:Yes
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