Ammonium orthomolybdate
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| General | |||||||||||||||||||
| Surname | Ammonium orthomolybdate | ||||||||||||||||||
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| Molecular formula | (NH 4 ) 2 MoO 4 | ||||||||||||||||||
| Brief description |
white, crystalline, odorless powder |
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| properties | |||||||||||||||||||
| Molar mass | 196.02 g mol −1 | ||||||||||||||||||
| Physical state |
firmly |
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| solubility |
poor in water (> 10 g l −1 at 20 ° C) |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
Ammonium orthomolybdate is the simplest representative of various chemical compounds that belong to the ammonium salts of molybdenum . It forms white, odorless crystals that weather with elimination of NH 3 , whereby various polymolybdates or hydrates are formed:
- Ammonium dimolybdate (NH 4 ) 2 Mo 2 O 7
- Ammoniumtetramolybdat (NH 4 ) 2 Mo 4 O 13 · 2 H 2 O
- Ammonium heptamolybdate (NH 4 ) 6 Mo 7 O 24 · 4 H 2 O
- Ammonium octamolybdate (NH 4 ) 4 Mo 8 O 26 · 5 H 2 O
- Ammoniumdecamolybdat (NH 4 ) 4 Mo 10 O 32 · 2 H 2 O
Ammonium octamolybdate is used as a smoke gas suppressor together with halogenated flame retardants in plastics .
Individual evidence
- ↑ a b c Entry on ammonium molybdate in the GESTIS substance database of the IFA , accessed on January 28, 2020(JavaScript required) .
- ↑ Data sheet ammonium molybdate from Sigma-Aldrich , accessed on January 28, 2020 ( PDF ).
- ↑ Entry on ammonium molybdates. In: Römpp Online . Georg Thieme Verlag, accessed on March 19, 2014.