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Silver Metatungstate, Ag2W4O13

Silver Metatungstate, Ag2W4O13.3H2O, is prepared by mixing together boiling solutions containing equivalent quantities of sodium metatungstate and silver nitrate in the presence of a little nitric acid. On cooling, the solution deposits a crust consisting of microscopic octahedra, which readily dissolve in water and may be recrystallised (by allowing the solution to evaporate) over sulphuric acid. The salt decomposes on heating.

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