Textbook Question
Predict the number of unpaired electrons for each of the following.
(c) Mn3+
(d) Cr2+
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Ch.21 - Transition Elements and Coordination Chemistry
McMurry8th EditionChemistryISBN: 9781292336145
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Table of contents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
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McMurry 8th EditionCh.21 - Transition Elements and Coordination ChemistryProblem 21.78b
McMurry 8th EditionCh.21 - Transition Elements and Coordination ChemistryProblem 21.78bChapter 21, Problem 21.78b
What is the systematic name for each of the following ions?
(c) [Co(CO3)3]3-
(d) [Pt(en)2(SCN)2]2+
Verified step by step guidance1
Identify the central metal ion in each complex: (c) Cobalt (Co), (d) Platinum (Pt).
Determine the oxidation state of the central metal ion by considering the charges of the ligands and the overall charge of the complex: (c) Carbonate (CO_3) is a -2 charge ligand, (d) Ethylenediamine (en) is a neutral ligand and thiocyanate (SCN) is a -1 charge ligand.
For complex (c), calculate the oxidation state of cobalt: Let x be the oxidation state of Co. The equation is x + 3(-2) = -3. Solve for x.
For complex (d), calculate the oxidation state of platinum: Let y be the oxidation state of Pt. The equation is y + 2(0) + 2(-1) = +2. Solve for y.
Name the complexes using the IUPAC naming conventions: (c) Use the oxidation state of cobalt and the name of the ligands to form the name. (d) Use the oxidation state of platinum and the name of the ligands to form the name.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Coordination Compounds
Coordination compounds consist of a central metal atom bonded to surrounding molecules or ions called ligands. The arrangement and type of ligands influence the properties and naming of the compound. Understanding the structure of coordination complexes is essential for determining their systematic names.
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01:32
Coordination Compound Naming
Ligands and Their Naming
Ligands are ions or molecules that donate electron pairs to the central metal atom in a coordination complex. They can be classified as monodentate, bidentate, or polydentate based on the number of donor atoms. The naming of ligands follows specific conventions, such as using prefixes to indicate the number of ligands present.
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02:03Ligand Naming
Oxidation States and Charge
The oxidation state of a metal in a coordination compound is crucial for determining its systematic name. The overall charge of the complex ion must be considered, as it affects the naming convention. For example, the oxidation state of cobalt in [Co(CO3)3]3- must be calculated to accurately name the compound.
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02:42Oxidation Numbers
Related Practice
Textbook Question
Cobalt(III) trifluoroacetylacetonate, Co(tfac)3, is a sixcoordinate, octahedral metal chelate in which three planar, bidentate tfac ligands are attached to a central Co atom:
(b) Diastereoisomers A and B have dipole moments of 6.5 D and 3.8 D, respectively. Which of your diastereoisomers is A and which is B?
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Textbook Question
Nickel(II) complexes with the formula NiX2L2, where X is Cl- or N-bonded NCS- and L is the monodentate triphenylphosphine ligand P(C6H5)3, can be square planar or tetrahedral.
(b) If NiCl2L2 is paramagnetic and Ni(NCS)2L2 is diamagnetic, which of the two complexes is tetrahedral and which is square planar?
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Textbook Question
For each of the following complexes, draw a crystal field energy-level diagram, assign the electrons to orbitals, and predict the number of unpaired electrons.
(b) [MnCl4]2- (tetrahedral)
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Textbook Question
For each of the following complexes, describe the bonding using valence bond theory. Include orbital diagrams for the free metal ion and the metal ion in the complex. Indicate which hybrid orbitals the metal ion uses for bonding, and specify the number of unpaired electrons.
(b) [Ag(NH3)2]+
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Textbook Question
The percent iron in iron ore can be determined by dissolving the ore in acid, then reducing the iron to Fe2+, and finally titrating the Fe2+ with aqueous KMnO4. The reaction products are Fe2+ and Mn2+.
(c) Draw a crystal field energy-level diagram for the reactants and products, MnO4-, 3Fe1H2O2642+, 3Fe1H2O2643+, and 3Mn1H2O2642+, and predict the number of unpaired electrons for each.
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