Cu(OH)₂ + (NH₄)₂*SO₄ + 2 NH₃ → [Cu(NH₃)₄]*SO₄ + 2 H₂O

This is a complexation reaction: [Cu(NH₃)₄]*SO₄ is the formed complex.

Reactants:

• Cu(OH)₂ – Copper(II) hydroxide
  • Other names: Cupric hydroxide , Cu(OH)2
  • Appearance: Blue or blue-green solid
• (NH₄)₂*SO₄
• NH₃
  • Names: Ammonia , Azane (only intended for use in naming derivatives of ammonia) , Hydrogen nitride ... show moreAmmonia (anhydrous) , Azane , NH3 , Trihydrogen nitride , R717 , Refrigerant gas 717 , Anhydrous ammonia , Aqua ammonia , Aqueous ammonia , [Note: Often used in an aqueous solution.] show less
  • Appearance: Colourless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a pungent, suffocating odor. [Note: Shipped as a liquefied compressed gas. Easily liquefied under pressure.]

Products:

• [Cu(NH₃)₄]*SO₄
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas