Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 13, Problem 13.10QAP
Zinc(II) and the ligand L form a 1:1 complex that absorbs strongly at 600 nm. As long as the molar concentration of L exceeds that of zinc(II) by a factor of 5, the absorbance depends only on the cation concentration. Neither zinc(II) nor L absorbs at 600 nm. A solution that is 1.59 × 10-4 M in zinc(II) and 1.00 × 10-3 M in L has an absorbance of 0.352 in a 1.00-cm cell at 600 nm. Calculate
(a) the percent transmittance of this solution.
(b) the percent transmittance of this solution in a 2.50-cm cell.
(c) the molar absorptivity of the complex.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
at 580 nm, which is the wavelength of its maximum absorption the complex Fe(SCN)2+ has a molar absoptivity of 7.00x10^3 L cm-1 mol-1. Determine the absorbance of a 3.50 x10^-5 M solution of the complex at 580 nm in a 1 cm cell
Express in 3SF
Consider the octahedral complex [FeBr6] 4−. In water solution it has an absorption peak at 864 nm with a molar absorptivity (ε) of 3.6 L mol-1 cm-1 .
(a) What is the energy (in wavenumbers, cm-1 ) of the absorption peak? Show all work.
(b) How many valence d electrons does the metal center have? Justify your answer.
(c) How many unpaired electrons per molecule would a magnetic susceptibility experiment predict? What would the S number be for this transition metal center? Justify your answers.
(d) What electronic transition results from absorption of 864-nm light?
(e) Calculate the ligand stabilization energy (in units of ∆o) and units of coulombic (Πc) energy.
(f) How would the ligand field strengths (∆o) of [Fe(NH3)6] 2+ and [Fe(bipy)3] 2+ differ from that of [FeBr6] 4−? Why?
We have a mixture of 100 mL of Fe3+ solution (1.00 × 10–3 M) and 100 mL of A- ion solution (1.00 × 10–3 M). The mixture has a deep blue color, indicating the formation of a complex between Fe3+ and A-. From spectrophotometric analysis, we find that 30.0% of the Fe3+ is in the form of a complex, where there are two probable formulae: FeX2+ or FeX3. a. Balance the following equations and calculate the concentrations of the remaining species. b. After reaching equilibrium states, write the equilibrium expressions and the equilibrium constants for both cases in (a).
Chapter 13 Solutions
Principles of Instrumental Analysis
Ch. 13 - Prob. 13.1QAPCh. 13 - Prob. 13.2QAPCh. 13 - Prob. 13.3QAPCh. 13 - Prob. 13.4QAPCh. 13 - Prob. 13.5QAPCh. 13 - Prob. 13.6QAPCh. 13 - Prob. 13.7QAPCh. 13 - At 580 nm, which is the wavelength of its maximum...Ch. 13 - Prob. 13.9QAPCh. 13 - Zinc(II) and the ligand L form a 1:1 complex that...
Ch. 13 - The equilibrium constant for the conjugate...Ch. 13 - The equilibrium constant for the reaction...Ch. 13 - Prob. 13.13QAPCh. 13 - Prob. 13.14QAPCh. 13 - Prob. 13.15QAPCh. 13 - Prob. 13.16QAPCh. 13 - Prob. 13.17QAPCh. 13 - Prob. 13.18QAPCh. 13 - Prob. 13.19QAPCh. 13 - Prob. 13.20QAPCh. 13 - Prob. 13.21QAPCh. 13 - Prob. 13.22QAPCh. 13 - Prob. 13.23QAPCh. 13 - Prob. 13.24QAPCh. 13 - Prob. 13.25QAPCh. 13 - Prob. 13.26QAPCh. 13 - Prob. 13.27QAP
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- a. In the absorption spectrum of the complex ion Cr(NCS)63, there is a band corresponding to the absorption of a photon of light with an energy of 1.75 104 cm-1. Given 1 cm1 = 1.986 1023 J, what is the wavelength of this photon? b. The CrNC bond angle in Cr(NCS)63 is predicted to be 180. What is the hybridization of the N atom in the Ncs- ligand when a Lewis acid-base reaction occurs between Cr3+ and NCs- that would give a 180 CrNC bond angle? Cr(NCS)63 undergoes substitution by ethylenediamine (en) according to the equation Cr(NCS)63+2enCr(NCS)2(en)2++4NCS Does Cr(NCS)2(en)2+ exhibit geometric isomerism? Does Cr(NCS)2(en)2+ exhibit optical isomerism?arrow_forwardAmmonia and potassium iodide solutions are added to an aqueous solution of Cr(NO3)3. A solid is isolated (compound A), and the following data are collected: i. When 0.105 g of compound A was strongly heated in excess 0 2, 0.0203 g CrO3 was formed. ii. In a second experiment it took 32.93 mL of 0.100 M HCI to titrate completely the NH3 present in 0.341 g compound A. iii. Compound A was found to contain 73.53% iodine by mass. iv. The freezing point of water was lowered by 0.64C when 0.601 g compound A was dissolved in 10.00 g H2O (Kf =1.86Ckg/mol). What is the formula of the compound? What is the structure of the complex ion present? (Hints: Cr3+ is expected to be sixcoordinate, with NH3 and possibly I as ligands. The I ions will be the counterions if needed.)arrow_forwardTrimethylphosphine, P(CH3)3, can act as a ligand by donating the lone pair of electrons on the phosphorus atom. If trimethylphosphine is added to a solution of nickel(Il) chloride in acetone, a blue compound that has a molecular mass of approximately 270 g and contains 21.5% Ni, 26.0% Cl, and 52.5% P(CH3)3 can be isolated. This blue compound does not have any isomeric forms. What are the geometry and molecular formula of the blue compound?arrow_forward
- One of the following nitrogen compounds or ions is not capable of serving as a ligand: NH4+, NH3, NH2. Identify this species, and explain your answer.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_forwardPlatinum(II) forms many complexes, among them those with the following ligands. Give the formula and charge of each complex. (a) two ammonia molecules and one oxalate ion (C2O42-) (b) two ammonia molecules, one thiocyanate ion (SCN-), and one bromide ion (c) one ethylenediamine molecule and two nitrite ionsarrow_forward
- At 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00x 103 L cm-1 mol-1. Calculate (a) the absorbance of a 3.40 x 10–5 M solution of the complex at 580 nm in a 1.00-cm cell. (b) the absorbance of a solution in which the concentration of the complex is twice that in (a). (c) the transmittance of the solutions described in (a) and (b). (d) the absorbance of a solution that has half the transmittance of that described in (a).arrow_forwardAt 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00x103 L mol-1 cm-1. Calculate a.) the absorbance of 2.50x10-5 M solution of the complex at 580 nm in 1.00-cm cell. b.) the absorbance of a solution in which the concentration of the complex is twice that in part (a). c.) the transmittance of the solutions described in parts (a) and (b). d.) the absorbance of a solution that has half the transmittance of that described in part (a).arrow_forwardAt 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00 X 103 L mol-1 cm-1. Calculate (a) the absorbance of a 2.50 X 10-5 M solution of the complex at 580 nm in a 1.00-cm cell. (b) the absorbance of the solution in which the concentration of the complex is twice that in part (a) (c) the transmittance of the solutions described in parts (a) and (b) (d) the absorbance of a solution that has half the transmittance of that described in part (a) answer letter d pleasearrow_forward
- Take into consideration metal Z(III) ion which is able to form octahedral complexes with elther fluoride or cyanide ions, What can be said about the colors of the complexes formed when one complex ion absorbs at 650 nm while the other at 430 nm?arrow_forwardWhen the Ti3+ ion is complexed by ligands X (a neutral molecule) and Y (an anion) it gives octahedral species of the type [TI)6]3+ and [TIY)6, respectively, which have two different colours. The complex containing ligand X shows a single absorbance in the visible region with a peak maximum at 520 nm, while that containing Y has a peak maximum at 580 nm. Which of the two ligands produces the higher crystal field splitting energy (CFSE) for Cu2+? O a. The crystal field splitting is not caused by the ligand as one complex is a cation and one is an anion Ob. The CFSES for the two complexes are the same OG Ligand X produces the higher CFSE O d. Ligand Y produces the higher CFSEarrow_forwarda) Identify the ground terms for Fe²* in the case of free ion and octahedral complexes; [Fe(H2O)6]²* and [Fe(CN)6]+. b) Write all spin-allowed transitions with their energy terms for the complexes using Tanabe-Sugano diagram. c) The absorption spectrum of [Fe(H2O)6]²* shows a maximum at 1000 nm with a shoulder at 1250 nm. Estimate the value of A, for [Fe(H2O)«]?+ in cm' unit and determine the transition responsible for this shoulder. d) Give a comparison on the color of the complexes.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Chemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage Learning
ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage Learning
Chemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
Principles of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage Learning
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry: An Atoms First Approach
Chemistry
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Cengage Learning
Principles of Modern Chemistry
Chemistry
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:Cengage Learning
The Bohr Model of the atom and Atomic Emission Spectra: Atomic Structure tutorial | Crash Chemistry; Author: Crash Chemistry Academy;https://www.youtube.com/watch?v=apuWi_Fbtys;License: Standard YouTube License, CC-BY