Question 22.2: Write the names of the following coordination compounds: (a)...

Write the names of the following coordination compounds: (a) [Co(NH₃)₄Cl₂]Cl and (b) K₃[Fe(CN)₆].

Strategy For each compound, name the cation first and the anion second. Refer to Tables 22.4 and 22.5 for the names of ligands and anions containing metal atoms.

Setup (a) The cation is a complex ion containing four ammonia molecules and two chloride ions. The counter ion is chloride (Cl^–), so the charge on the complex cation is +1, making the oxidation state of cobalt +3.

(b) The cation is K⁺, and the anion is a complex ion containing six cyanide ions. The charge on the complex ion is -3, making the oxidation state of iron +3.

TABLE 22.4	Names of Common Ligands in Coordination Compounds
Ligand	Name of Ligand in Coordination Compound
Bromide (Br^–)	Bromo
Chloride (Cl^–)	Chloro
Cyanide (CN^–)	Cyano
Hydroxide (OH^–)	Hydroxo
Oxide (O^2-)	Oxo
Carbonate ( $CO_{3}^{2-}$ )	Carbonato
Nitrite ( $NO_{2}^{-}$ )	Nitro
Oxalate ( $C_{2}O_{4}^{2-}$ )	Oxalato
Ammonia (NH₃)	Ammine
Carbon monoxide (CO)	Carbonyl
Water (H₂O)	Aqua
Ethylenediamine	Ethylenediamine
Ethylenediaminetetraacetate	Ethylenediaminetetraacetate

TABLE 22.5	Names of Anions Containing Metal Atoms
Metal	Name of Metal in Anionic Complex
Aluminum	Aluminate
Chromium	Chromate
Cobalt	Cobaltate
Copper	Cuprate
Gold	Aurate
Iron	Ferrate
Lead	Plumbate
Manganese	Manganate
Molybdenum	Molybdate
Nickel	Nickelate
Silver	Argentate
Tin	Stannate
Tungsten	Tungstate
Zinc	Zincate

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