Question on: JAMB Chemistry - 2024
The IUPAC nomenclature of the complex K₄Fe(CN)₆ is
Here's how to determine the correct IUPAC name for K₄Fe(CN)₆:
1. Identify the cation and anion: The compound is an ionic compound. The cation is potassium (K⁺) and the anion is the complex ion [Fe(CN)₆]⁴⁻.
2. Name the ligands: The ligand is cyanide (CN⁻). Since there are six cyanide ligands, the prefix 'hexa' is used.
3. Name the central metal: The central metal is iron (Fe).
4. Determine the oxidation state of the metal: Potassium (K) has a +1 charge. Four potassium ions contribute +4. Six cyanide ligands contribute -6. Let x be the oxidation state of iron: +4 + x - 6 = 0 → x = +2.
5. Combine the names: The IUPAC name is potassium hexacyanoferrate(II). The Roman numeral (II) indicates the oxidation state of iron.
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