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12 Απρ 2023 · As an example of the formation of complex ions, consider the addition of ammonia to an aqueous solution of the hydrated Cu 2+ ion { [Cu (H 2 O) 6] 2+}. Because it is a stronger base than H 2 O, ammonia replaces the water molecules in the hydrated ion to form the [Cu (NH 3) 4 (H 2 O) 2] 2+ ion.
- 14.4: Complex ion Equilibria and Complexometric Titrations
In this unit, the concept of complex ion formation and...
- 14.4: Complex ion Equilibria and Complexometric Titrations
29 Αυγ 2023 · In this unit, the concept of complex ion formation and associated stepwise equilibrium reactions will be examined and discussed.
In some cases, ammonia replaces water around the central metal ion to give another soluble complex. This is known as a ligand exchange reaction, and involves an equilibrium such as this one: The formation of this new soluble complex causes the precipitate to dissolve.
The addition of aqueous ammonia to the solution results in the formation of the intensely blue-violet [Cu(NH 3) 4 (H 2 O) 2] 2+ ions, usually written as [Cu(NH 3) 4] 2+ ion (right) because ammonia, a stronger base than H 2 O, replaces water molecules from the hydrated Cu 2+ ion.
The Stepwise Formation of Complex Ions . When a transition-metal ion binds Lewis bases to form a coordination complex, or complex ion, it picks up these ligands one at a time. The Ag + ion, for example, combines with NH 3 in a two-step reaction. It first picks up one NH 3 molecule to form a one-coordinate complex. Ag + (aq) + NH 3 (aq) Ag(NH 3 ...
Some common ligands include water, ammonia, and other simple molecules that can easily donate a pair of electrons to form a bond with the central atom or ion. Ligands can also be more complex molecules or ions, such as organic compounds or metal ions.
24 Σεπ 2020 · As an example of dissolution by complex ion formation, consider what happens when aqueous ammonia is added to a mixture of silver chloride and water. Silver chloride dissolves slightly in water, giving a small concentration of Ag + ( [Ag +] = 1.3 × 10 −5 M):
