Atomistry » Molybdenum » Compounds » Molybdosilicic Acid and Molybdosilicates
Atomistry »
  Molybdenum »
    Compounds »
      Molybdosilicic Acid and Molybdosilicates »

Molybdosilicic Acid and Molybdosilicates

When a boiling solution of sodium silicate is saturated with molybdic acid it becomes intensely yellow, and on evaporation at 45° C. deposits yellow crystals of composition 2Na2O.SiO2.12MoO3.21H2O. The compound may also be obtained by heating a mixture of sodium silicate and molybdic acid with a little water in a sealed tube at 150° C., or by addition of hydrofluosilicic acid, or sodium silicofluoride, to an acidified solution of sodium molybdate. By these methods, or by double decomposition, numerous salts have been prepared, and they are considered by Rosenheim to belong to a type of heteropoly-compounds of general formula

R4H4[Si(Mo2O7)6].xH2O,

being acid salts of an octobasic acid. Salts of practically all the common metals have been prepared. Many of them form different hydrates, and they are usually isomorphous with the corresponding silicotungstates. The sodium and alkaline earth salts are readily soluble in water, the potassium and ammonium salts are less soluble, while the mercurous, thallium, and rubidium salts are very sparingly soluble.

Last articles

Zn in 9JYW
Zn in 9IR4
Zn in 9IR3
Zn in 9GMX
Zn in 9GMW
Zn in 9JEJ
Zn in 9ERF
Zn in 9ERE
Zn in 9EGV
Zn in 9EGW
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy