Tetraamminecopper(II) sulfate

Tetraamminkupfer ( II) sulfate

Fixed

1.81 g · cm -3

Monohydrate

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Tetramminkupfer (II ) sulfate, [Cu (NH3) 4 ] SO4, and Tetraamminkupfer ( II) sulfate is a complex of divalent copper salt and sulfuric acid. As a solid, it is present as monohydrate [Cu (NH3 ) 4] SO4 · H2O. The deep blue color of the salt crystals is caused by the tetraammine [Cu (NH3 ) 4] 2 of copper, which is complexed in aqueous solution by two other water molecules. The slowly to a green powder efflorescent in air, salt has a decomposition point of about 150 ° C.

Tetramminkupfer (II ) sulfate is produced by mixing an aqueous copper (II ) sulfate solution with ammonia water in excess:

The color change from pale blue to deep blue can be used for the detection of copper ions. Tetramminkupferkomplexes based on formation of the use of copper salts as an invisible ink.

Although the tetrammine copper ( II) salts stable complex salts by reaction with hydrogen sulfide ( H2S) is possible: In the case of the addition of hydrogen sulfide ( H2S), black copper (II ) sulfide was precipitated. Resulting from the equilibrium of the complex of copper ( II) ion concentration according to the equation

Is higher than the max. Solution concentration of copper ( II) sulfide. Therefore, in spite of the complex compound of copper (II ) sulfide was precipitated.

With the addition of lime to a solution of Tetramminkupfer (II ) sulphate is a blue-green precipitate forms. This color pigment, also known as Kalkblau or Neuwied blue, is used for painting colors.