GENERAL CHEMISTRY-MOD.MASTERINGCHEM.
11th Edition
ISBN: 9780134193601
Author: Petrucci
Publisher: PEARSON
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Chapter 24, Problem 70SAE
The oxidation state of Ni in the complex ion
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If a solution known to be made up of an octahedral cobalt complex ion [Co(NH3)6]3+ appears orange to the eye,
(a) What wavelength of light does it absorb from the color wheel? Please explain.
(b) What is the crystal field splitting Δo (10Dq) for the complex ion? Please calculate in kJ.mole-1.
(c) Calculate the crystal field stabilization energy of the complex ion in kcal.mole-1 (Please neglect πe and πc energies when calculating).
(Co:27, h=6.626x10-34 J.s, c=3x108 m.s-1)
The complex ion [Co(H2O)6]3+ exhibits absorbance with max = 600 nm (orange region) , while [Co(NH3)6]3+ exhibits absorbance with max = 475 nm (blue region). (a) Determine the color of each complex ion. (b) Calculate the crystal-field splitting in each complex ion; expressed the splitting energy in kJ/mol. (No = 6.022 x 1023/mol; h = 6.626 x 10–34 J.s.; c = 3.00 x 108 m/s)
Here are the answers for part (b), I am having a hard time trying to get these answers. Can you please show your work for part (b)?
[Answers: (b) [Co(H2O)6]3+ : max = 600. nm; octahedral splitting energy, O = 200. kJ/mol; [Co(NH3)6]3+ : max = 475 nm; octahedral splitting energy, O = 252 kJ/mol]
5.
(a)
(b)
The complex ion NiC4² has two unpaired electrons, whereas Ni(CN)42 is diamagnetic.
Propose structures for these two complex ions (square-planar or tetrahedral).
Draw the crystal field diagrams of two complex ions.
Chapter 24 Solutions
GENERAL CHEMISTRY-MOD.MASTERINGCHEM.
Ch. 24 - Prob. 1ECh. 24 - Prob. 2ECh. 24 - Prob. 3ECh. 24 - Write appropriate formulas for the following. a....Ch. 24 - Prob. 5ECh. 24 - Prob. 6ECh. 24 - Prob. 7ECh. 24 - Prob. 8ECh. 24 - Prob. 9ECh. 24 - Prob. 10E
Ch. 24 - Prob. 11ECh. 24 - Prob. 12ECh. 24 - If A, B, C, and D are four different ligands, a....Ch. 24 - Prob. 14ECh. 24 - Prob. 15ECh. 24 - The structures of four complex ions are given....Ch. 24 - Prob. 17ECh. 24 - Prob. 18ECh. 24 - Prob. 19ECh. 24 - In contrast to the case of Co2+ considered in...Ch. 24 - Prob. 21ECh. 24 - Prob. 22ECh. 24 - Prob. 23ECh. 24 - Prob. 24ECh. 24 - Prob. 25ECh. 24 - Prob. 26ECh. 24 - Prob. 27ECh. 24 - Prob. 28ECh. 24 - Prob. 29ECh. 24 - Prob. 30ECh. 24 - Prob. 31ECh. 24 - Prob. 32ECh. 24 - Prob. 33ECh. 24 - Prob. 34ECh. 24 - Prob. 35ECh. 24 - Prob. 36ECh. 24 - Prob. 37ECh. 24 - Draw dashed and solid wedge diagrams of...Ch. 24 - Prob. 39IAECh. 24 - Prob. 40IAECh. 24 - Prob. 41IAECh. 24 - Prob. 42IAECh. 24 - Prob. 43IAECh. 24 - Prob. 44IAECh. 24 - Prob. 45IAECh. 24 - Prob. 46IAECh. 24 - Prob. 47IAECh. 24 - Prob. 48IAECh. 24 - Prob. 49IAECh. 24 - Prob. 50IAECh. 24 - Prob. 51IAECh. 24 - Prob. 52IAECh. 24 - Prob. 53IAECh. 24 - Prob. 54IAECh. 24 - The compound CoCl22H2O4NH2 may be one of the...Ch. 24 - Prob. 56IAECh. 24 - Provide a valence bond description of the bonding...Ch. 24 - Prob. 58IAECh. 24 - Prob. 59IAECh. 24 - Prob. 60IAECh. 24 - Prob. 61IAECh. 24 - Prob. 62IAECh. 24 - The graph that follows represents the molar...Ch. 24 - Prob. 64FPCh. 24 - Prob. 65FPCh. 24 - The crystal field stabilization energy (CFSE) can...Ch. 24 - In your own words, describe the following terms or...Ch. 24 - Briefly describe each of the following ideas,...Ch. 24 - Prob. 69SAECh. 24 - The oxidation state of Ni in the complex ion...Ch. 24 - Prob. 71SAECh. 24 - Prob. 72SAECh. 24 - Prob. 73SAECh. 24 - Prob. 74SAECh. 24 - Prob. 75SAECh. 24 - The most soluble of the following solids in...Ch. 24 - Prob. 77SAECh. 24 - Write appropriate formulas for the following...Ch. 24 - Prob. 79SAECh. 24 - Prob. 80SAECh. 24 - Prob. 81SAECh. 24 - Prob. 82SAECh. 24 - Prob. 83SAECh. 24 - Prob. 84SAE
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- Four different octahedral chromium coordination compounds exist that all have the same oxidation state for chromium and have H2O and Cl as the ligands and counterions. When 1 mole of each of the four compounds is dissolved in water, how many moles of silver chloride will precipitate upon addition of excess AgNO3?arrow_forward(a) Name this coordination compound: [Ag(NH3)2]NO3. (b) Write the formula of pentaaquaisothiocyanatoiron(III) chloride.arrow_forwardAn aqueous solution of [Rh(C2O4)3]3− is yellow. Predict the approximate wavelength and predominant color of light absorbed by the complex.arrow_forward
- What type of isomerism is shown by the complex [Cr(H20)6]Cl3? (ii) On the basis of crystal field theory, write the electronic configuration for d4 ion if Δ0 > P. (iii) Write the hybridization and shape of [CoF6]3-. (Atomic number of Co = 27)arrow_forwardComplete the following redox reaction, where X is H2O, NCS-, SCN-, and I-.[Co(NH3)5X]2++ [Cr(H2O)6]2+ → ? Answer the following questions:(a) propose the reaction mechanism, )(b) suggest the order of the rate of reaction, and (c) explain the variation in the rate of reactionarrow_forwardIn 2001, chemists at SUNY-Stony Brook succeeded in syn-thesizing the complex trans-[Fe(CN)4(CO)2]2-, which could be a model of complexes that may have played a role in the origin of life. Sketch the structure of the complex.arrow_forward
- Draw the energy diagram for d-orbital electron configuration in the octahedral field for each of the following complex ions. Indicate whether the ion is paramagnetic or diamagnetic: (a) [Cr(H2O)6]3+ (H2O is a weak-field ligand) (b) [Cr(NH3)6]3+ (NH3 is a strong-field ligand) (c) [CoF6]3– (F– is a weak-field ligand) (d) [Co(CN)6]3– (CN– is a strong-field ligand) (e) [Ni(H2O)6]2+ (H2O is a weak-field ligand) (f) [Ni(en)3]2+ (en is a strong-field ligand)arrow_forwardThe complex ion [Co(CO3)3]3-, an octahedral complex with bidentate carbonate ions as ligands, has one absorption in the visible region of the spectrum at 640 nm. From this information, (a) Predict the color of this complex and explain your reasoning. (b) Is the carbonate ion a weak- or strong-field ligand? (c) Predict whether [Co(CO3)3]3- will be paramagnetic or diamagnetic.arrow_forwardCobalt (II) chloride can form two complexes when dissolved in water: [Co(H2O)6]2+(aq) which is pink in colour, and [CoCl4]2- which is blue. The equilibrium system isarrow_forward
- [Cr(H2O)6] 2+ is violet. Another CrL6 complex is green. Can ligand L be CN-? Can it be Cl-? Explain.arrow_forward(i) What type of isomerism is shown by the complex [Cr(H2O)6]Cl3?(ii) On the basis of crystal field theory, write the electronic configuration for d4 ion if Δ0 > P.(iii) Write the hybridization and shape of [CoF6]3-.(Atomic number of Co = 27)arrow_forwardConsider the following complex ions: [NiBr6]4-,[Ni(H2O)6]3+ and [Ni(CO)6]3+. Using the Crystal Field Theory, in each case (i) draw d-orbital electron configurations (ii) determine the number of unpaired electrons (iii) predict the magnetic properties (iv) state and explain the complex is high-spin or low-spin.arrow_forward
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