* Complex Ions: Complex salts contain complex ions, which are formed by a central metal ion surrounded by ligands.

* Tetraamine Copper(II) Ion: In this case, the complex ion is [Cu(NH₃)₄]²⁺. The central metal ion is copper(II) (Cu²⁺), and the ligands are four ammonia molecules (NH₃).

* Counter Ion: The counter ion in this complex salt is the sulfate ion (SO₄²⁻).

Overall Structure: The complete formula for tetraamine copper(II) sulfate is [Cu(NH₃)₄]SO₄.

Key Characteristics of Complex Salts:

* They involve coordination bonds between a metal ion and ligands.

* The complex ion often has a different color than the simple metal ion.

* They exhibit unique chemical and physical properties.

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