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Ammonium molybdate 4-water

Ammonium molybdate 4-water

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Ukraine, Dnipro
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Description
Ammonium molybdate 4-water

Colourless or slightly greenish crystals in the form of prisms, the square of 2,498 g/cm3. On air salt disappears, losing part NH3; when heating to 150 °C decays on MoO3, H2O and NH3. The reactant is soluble in water, strong acids and solutions of alkalis.

Solution of ammonium molybdate in nitric acid is called molybdenic liquid.

Prigotovleniye-Ammony molibdenovokislyy.4-water, H


1. The preparation can be received from technical molybdic oxide:


7MoO3 + 6NH4OH = (NH4) 6Mo7O24 + 3H2O


In porcelain mortar pound 125 g of MoO3 (tekhn.) from 220 ml of water and 100 ml of NH4OH (the square 0,91). The received solution is filtered and the filter cake is washed out water ammonia. Add 5 ml 2 N (NH4)2S solution to filtrate and warm up. Then solution is filtered and boiled out until density of solution does not become equal 1,41 then add NH4OH (the square 0,91) before emergence of strong smell of ammonia and cool at frequent hashing. The dropped-out crystals suck away on Buchner filter.
Exit of 60%.

The received preparation usually corresponds to reactant of qualification of h and. From mother solution it is possible to allocate at evaporation still quantity of less pure preparation.
2. For preparation of molybdenic liquid dissolve 150 g of ammonium molybdate (h and.) in 1 l of water and solution pour in 1 l of HNO3 (the square 1,2) (not on the contrary!). The white deposit of molybdic acid which is dropping out in the beginning is dissolved. Solution is left on 48 h. If at the same time the deposit has dropped out, then carefully decant.

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