Question 22.3: Write formulas for the following compounds: (a) pentaamminec...
Write formulas for the following compounds: (a) pentaamminechlorocobalt(III) chloride and (b) dichlorobis(ethylenediamine)platinum(IV) nitrate.
Strategy If you can’t remember them yet, refer to Tables 22.4 and 22.5 for the names of ligands and anions containing metal atoms.
Setup (a) There are six ligands: five NH3 molecules and one Cl– ion. The oxidation state of cobalt is +3, making the overall charge on the complex ion +2. Therefore, there are two chloride ions as counter ions.
(b) There are four ligands: two bidentate ethylenediamines and two Cl– ions. The oxidation state of platinum is +4, making the overall charge on the complex ion +2. Therefore, there are two nitrate ions as counter ions.
| 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 (O2-) | 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 |
(a) [Co(NH3)5Cl]Cl2
(b) [Pt(en)2Cl2](NO3)2
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