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The compound tetraamminecopper(II) sulphate, or [Cu(NH3)4]SO4.5H2O, a double salt.

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Werner's theory states that the transition metal cation will have two valencies: a primary and a secondary. The primary valence is equal to the oxidation number of the metal cation, is ionizable, and can be satisfied by negative charges.


The compound tetraamminecopper(II) sulphate, or [Cu(NH<sub>3</sub>)<sub>4</sub>]SO<sub>4</sub>.5H<sub>2</sub>O, a double salt.






 
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