Interpretation:
The soluble solid in NH3 should be determined.
Concept introduction:
A complex ion is a polyatomic cation or anion composed of a central metal ion to which other groups (molecules or ions) called ligands are bonded. Coordination compounds are substances containing complex ions.
To describe the ionization of a weak acid, we use the ionization constant for a solubility equilibrium, we use the solubility product constant Ksp. The equilibrium constant that is used to deal with complex-ion equilibrium is called the formation constant. The formation constant, Kf, of a complex ion is the equilibrium constant describing the formation of a complex ion from a central ion and its attached groups.
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General Chemistry: Principles and Modern Applications (11th Edition)
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