Write formulas for the following ions or compounds: (a)...

Write formulas for the following ions or compounds:
(a) tetraammineaquachlorocobalt(III) chloride
(b) pentaamminesulfatochromium(III) bromide
(c) potassium tetracyanonickelate(II)
(d) pentamminenitratoiron(II)

Key Concepts

Charge Balancing

Charge balancing is the process of ensuring that the sum of the charges from the central metal ion and its ligands equals the overall charge of the complex ion, which is then neutralized by appropriate counter ions in the compound. This concept is crucial for correctly writing the chemical formula.

Ligands

Ligands are atoms, ions, or molecules that donate one or more pairs of electrons to a central metal ion to form coordinate covalent bonds. They can be neutral or carry a charge, and their identity and coordination number directly affect the structure and charge of the coordination complex.

Coordination Compound Nomenclature

The systematic naming of coordination compounds follows established IUPAC rules, where the names of the ligands are listed before the metal ion, and numerical prefixes indicate the number of each type of ligand. The oxidation state of the metal is specified in parentheses using Roman numerals, guiding the construction of the chemical formula.

Coordination Compounds

Coordination compounds are substances where a central metal ion is bonded to surrounding molecules or ions known as ligands. Understanding these compounds involves identifying the coordination sphere (the part that includes the metal and its attached ligands) and the counter ions that balance the overall compound charge.

Oxidation States

The oxidation state of the central metal ion is critical in determining the formula of coordination compounds. It reflects the effective charge of the metal after accounting for the electrons contributed by the ligands, thereby guiding how many and which counter ions are needed to achieve a neutral overall charge.

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