Identify the correct IUPAC name for the complex acid . — Coordination Compounds Chemistry Question

💡 Solution & Explanation

The complex is $H_4[Pt(CN)_6]$. The cation is Hydrogen. (Do not use prefixes like tetra for the counter ion). The anionic coordination sphere is $[Pt(CN)_6]^{4-}$. The ligand is cyanido ($CN^-$), and there are six (hexacyanido). Since the sphere is anionic, the metal takes the '-ate' suffix (platinate). The oxidation state of Pt is $x + 6(-1) = -4 \Rightarrow x = +2$. Therefore, the name is Hydrogen hexacyanidoplatinate(II). (Note: older nomenclature sometimes used 'hexacyanoplatinic(II) acid', but modern IUPAC prefers naming it as a standard salt).