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Strontium Tungstates

The anhydrous normal salt, SrWO4, is precipitated on the addition of strontium acetate solution to a solution of a normal alkali tungstate, or it may be obtained in the crystalline form by fusing together strontium chloride, sodium tungstate, and sodium chloride. The crystals are white, translucent, tetragonal bipyramids, a:c = 1:1.5582, and of density 6.184.

Strontium ditungstate, SrO.2WO3.3H2O, is described by Lefort as a white precipitate formed by the addition of strontium acetate to sodium ditungstate solution. It is only slightly soluble in water and becomes anhydrous on heating.

Strontium paratungstate, 3SrO.7WO3.16H2O, is precipitated on adding a hot solution of a paratungstate to a hot solution of strontium chloride or nitrate, using excess of the strontium salt. It is a granular crystalline powder, which does not fuse at red heat. The double salt, Na2O.4SrO.12WO3.29H2O, is obtained by adding a strontium salt to a boiling solution of sodium paratungstate until the precipitate no longer redissolves; on filtering and allowing the solution to crystallise, white scales separate. The salt on heating turns yellow but does not fuse.

The salt, 4SrO.10WO3.26H2O, is a white insoluble granular powder obtained in the same way as the corresponding barium and calcium salts. Strontium tritungstate, SrO.3WO3.5H2O, is described by Lefort.

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