Copper -selenate.pentahydrate

By the action of ammonia on copper selenate pentahydrate, small bluish-violet needle-like crystals of copper selenate tetrammoniate mono-hydrate, CuSe04.4NH3.H20, are obtained. On exposure to the air these crystals slowly evolve, ammonia and become dull in appearance. They are soluble in water, giving a deep blue solution, which on dilution becomes lighter in colour and deposits basic copper salts. When the crystals are exposed to the action of air for many hours, the preliminary evolution of ammonia ceases and the blue product has the composition CuSe04.3NHa.H20. When the bluish-violet crystals of the tetrammoniate monohydrate are dried over lime in a desiccator under a low... 

Copper selenate, like the corresponding sulphate, is best known in the form of the pentahydrate. When the latter is dehydrated at 102° C. it is converted into the monohydrate, dehydration being complete at 230° to 235° C. Copper selenate can also be obtained in the trihydrated form.8... 

Copper(ll) selenate pentahydrate CuSe03-6H30 10031-46-6 296.68 blue trici cry 80 dec 2.66 27.4 sacid, NH,OH sl ace 1 FtOH... 

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