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Sodium molybdate, Na 2 MoO 4, is useful as a source of molybdenum. [2] This white, crystalline salt is often encountered as the dihydrate, Na 2 MoO 4 ·2H 2 O. Preparation
Molybdate (usually in the form of potassium molybdate) is also used in the analytical colorimetric testing for the concentration of silica in solution, called the molybdenum blue method. [21] Additionally, it is used in the colorimetric analysis of phosphate concentration in association with the dye malachite green .
The dihydrate (image shown above) has the same layer structure with the "extra" H 2 O molecule intercalated between the layers. [4] Structure of molybdic acid in solution
Ammonium heptamolybdate is the inorganic compound whose chemical formula is (NH 4) 6 Mo 7 O 24, normally encountered as the tetrahydrate.A dihydrate is also known. It is a colorless solid, often referred to as ammonium paramolybdate or simply as ammonium molybdate, although "ammonium molybdate" can also refer to ammonium orthomolybdate, (NH 4) 2 MoO 4, and several other compounds.
The resulting trioxide can be purified by sublimation. The laboratory synthesis of the dihydrate entails acidification of aqueous solutions of sodium molybdate with perchloric acid: [12] Na 2 MoO 4 + H 2 O + 2 HClO 4 → MoO 3 ·2H 2 O + 2 NaClO 4. The dihydrate loses water readily to give the monohydrate. Both are bright yellow in color.
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