Chapter22ISM

Chapter22ISM - CHAPTER 22 TRANSITION METAL CHEMISTRY AND...

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CHAPTER 22 TRANSITION METAL CHEMISTRY AND COORDINATION COMPOUNDS Problem Categories Conceptual : 22.11, 22.12, 22.23, 22.24, 22.25, 22.26, 22.33, 22.34, 22.35, 22.36, 22.37, 22.38, 22.42, 22.51, 22.54, 22.58, 22.60, 22.61, 22.62, 22.64, 22.65, 22.66, 22.68, 22.69, 22.73, 22.75, 22.76. Descriptive : 22.41, 22.43, 22.44, 22.45, 22.47, 22.48, 22.49, 22.53, 22.63. Industrial : 22.72. Difficulty Level Easy : 22.13, 22.14, 22.23, 22.37, 22.53, 22.59. Medium : 22.11, 22.12, 22.15, 22.16, 22.17, 22.18, 22.24, 22.25, 22.26, 22.33, 22.35, 22.36, 22.45, 22.47, 22.48, 22.49, 22.50, 22.51, 22.52, 22.54, 22.56, 22.57, 22.58, 22.60, 22.64, 22.67, 22.68, 22.69, 22.70, 22.71. Difficult : 22.34, 22.38, 22.41, 22.42, 22.43, 22.44, 22.46, 22.55, 22.61, 22.62, 22.63, 22.65, 22.66, 22.72, 22.73, 22.74, 22.75, 22.76. 22.11 (a) En is the abbreviation for ethylenediamine (H 2 NCH 2 CH 2 NH 2 ). (b) The oxidation number of Co is + 3 . (Why?) (c) The coordination number of Co is six . (Why isn't this the same as the number of ligands?) (d) Ethylenediamine (en) is a bidentate ligand. Could cyanide ion be a bidentate ligand? Ask your instructor. 22.12 (a) The oxidation number of Cr is + 3 . (b) The coordination number of Cr is 6 . (c) Oxalate ion (C 2 O 4 2 ) is a bidentate ligand. 22.13 (a) The net charge of the complex ion is the sum of the charges of the ligands and the central metal ion. In this case the complex ion has a 3 charge. (Potassium is always + 1 . Why?) Since the six cyanides are 1 each, the Fe must be + 3 . (b) The complex ion has a 3 charge. Each oxalate ion has a 2 charge (Table 22.3 of the text). Therefore, the Cr must be + 3 . (c) Since cyanide ion has a 1 charge, Ni must have a + 2 charge to make the complex ion carry a 2 net charge. 22.14 Strategy: The oxidation number of the metal atom is equal to its charge. First we look for known charges in the species. Recall that alkali metals are + 1 and alkaline earth metals are + 2. Also determine if the ligand is a charged or neutral species. From the known charges, we can deduce the net charge of the metal and hence its oxidation number. Solution: (a) Since sodium is always + 1 and the oxygens are 2, Mo must have an oxidation number of + 6 . (b) Magnesium is + 2 and oxygen 2; therefore W is + 6 . (c) CO ligands are neutral species, so the iron atom bears no net charge. The oxidation number of Fe is 0 .
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CHAPTER 22: TRANSITION METAL CHEMISTRY AND COORDINATION COMPOUNDS 636 22.15 (a) tetraamminedichlorocobalt(III) (c) dibromobis(ethylenediamine)cobalt(III) (b) triamminetrichlorochromium(III) (d) hexaamminecobalt(III) chloride 22.16 Strategy: We follow the procedure for naming coordination compounds outlined in Section 22.3 of the text and refer to Tables 22.4 and 22.5 of the text for names of ligands and anions containing metal atoms. Solution: (a) Ethylenediamine is a neutral ligand, and each chloride has a 1 charge. Therefore, cobalt has a oxidation number of + 3. The correct name for the ion is cis dichlorobis(ethylenediammine)cobalt(III) . The prefix bis means two; we use this instead of di because di already appears in the name ethylenediamine. (b) There are four chlorides each with a 1 charge; therefore, Pt has a + 4 charge. The correct name for the compound is pentaamminechloroplatinum(IV) chloride . (c) There are three chlorides each with a 1 charge; therefore, Co has a + 3 charge. The correct name for the compound is pentaamminechlorocobalt(III) chloride .
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Chapter22ISM - CHAPTER 22 TRANSITION METAL CHEMISTRY AND...

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