It is named as triamminetriaquachromium(III) chloride. The ligands are arranged alphabetically, and the oxidation number of chromium is calculated from the charge on the complex ion, which is +3 due to the three chloride ions.
How is the coordination compound [Cr(NH₃)₃(H₂O)₃]Cl₃ named, and how is the oxidation number of chromium determined?
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The coordination compound [Cr(NH₃)₃(H₂O)₃]Cl₃ is named as triamminetriaquachromium(III) chloride. In the name, “triammine” denotes three ammonia ligands, “triaqua” refers to three water ligands, and “chromium(III)” indicates the chromium ion in the +3 oxidation state. The oxidation number of chromium is determined by considering the charge on the complex and the ligands. Since chloride (Cl⁻) has a charge of -1 and there are three chlorides, the overall charge is -3. Chromium must have a +3 oxidation state to balance the charge, indicating the oxidation number of the central metal in the complex.