Equations to show how the ff form complexes
A. Fe^2+ and H2O
B. Cr^3+ and NH3
C. Fe^3+ and CN^-
To illustrate the formation of complexes, we need to write equations that represent the reaction between the metal ion and the ligand. Here are the equations for the complexes formed:
A. Fe^2+ and H2O:
Fe^2+ + 6H2O ↔ [Fe(H2O)6]^2+
In this equation, the Fe^2+ ion reacts with six water molecules to form the hexaaqua complex ion, [Fe(H2O)6]^2+.
B. Cr^3+ and NH3:
Cr^3+ + 6NH3 ↔ [Cr(NH3)6]^3+
In this equation, the Cr^3+ ion reacts with six ammonia (NH3) molecules to form the hexaammine complex ion, [Cr(NH3)6]^3+.
C. Fe^3+ and CN^-:
Fe^3+ + 6CN^- ↔ [Fe(CN)6]^3-
In this equation, the Fe^3+ ion reacts with six cyanide (CN^-) ions to form the hexacyanido complex ion, [Fe(CN)6]^3-.
Please note that these equations represent simplified versions of the complex formation reactions, which involve the interaction between metal ions and ligands.