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
Question
Chapter 14, Problem 14.8QAP
Interpretation Introduction
(a)
Interpretation:
The molar concentration of nickel and cobalt in a solution should be determined.
Concept introduction:
The Beer-Lambert Law
A − absorbance
⁊ - molar absorptivity
l − length of the solution light passes through (cm)
c − concentration of solution (mol/L)
Interpretation Introduction
(b)
Interpretation:
The molar concentration of nickel and cobalt in a solution should be determined.
Concept introduction:
The Beer-Lambert Law
A − absorbance
⁊ - molar absorptivity
l − length of the solution light passes through (cm)
c − concentration of solution (mol/L)
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
4) Jitanium(IV) and vanadium(V) form çolored complexes when treated with bydrogen
peroxide in 1 M şulturic acid, The titanium complex has an absorption maximum at 415 nm,
and the vanadium complex has an absorption maximum at 455 nm. A 1.00x10-3 M şolution of
the titanium complex exibits an absorbance of 0.805 at 415 nm and of 0.465 at 455 nm, while
a 1.00x10-2 M şolution of the vanadium complex exibits absorbances of 0.400 and 0.600 at
415 and 455 pm. respectively. A 1.0 g sample of an alloy containing titanium and vanadium
was dissolved, treated with excess hydrogen peroxide, and diluted to a final volume of 100
mb. The absorbance of the solution was 0.8 at 415 nm and 0.6 at 455 nm. What were the
percentages of titanium and vanadium in the alloy?
2. Why is the absorbance spectrum of the iron (II) complex obtained first prior to
measuring the absorbance of the standard concentrations and unknown
samples?
A 0.402 g sample of a Ni() complex (molar mass of the complex is 294.96 g/mol) dissolved in 100.0 ml solution shows three absorption
maxima in the visible region at A = 731 nm (A = 0.0830), A2 = 646 nm (A= 0.1375), and at Ag = 445 (A = 0.1265)
The molar absorptivity (extinction coefficient, ca ) of the band at 731 nm is:
%3!
O o. 10.1
O b.5.4
O c. IL.8
O d. 9.0
O e. 6.09
Chapter 14 Solutions
Principles of Instrumental Analysis
Ch. 14 - Prob. 14.1QAPCh. 14 - A 0.4740-g pesticide sample was decomposed by wet...Ch. 14 - Sketch a photometric titration curve for the...Ch. 14 - Prob. 14.4QAPCh. 14 - Prob. 14.5QAPCh. 14 - The accompanying data (1.00-cm cells) were...Ch. 14 - A 3.03-g petroleum specimen was decomposed by wet...Ch. 14 - Prob. 14.8QAPCh. 14 - Prob. 14.9QAPCh. 14 - The acid-base indicator HIn undergoes the...
Ch. 14 - Prob. 14.11QAPCh. 14 - Prob. 14.12QAPCh. 14 - Copper(II) forms a 1:1 complex with the organic...Ch. 14 - Aluminum forms a 1:1 complex with...Ch. 14 - Prob. 14.15QAPCh. 14 - Prob. 14.16QAPCh. 14 - Prob. 14.17QAPCh. 14 - Prob. 14.18QAPCh. 14 - Prob. 14.19QAPCh. 14 - Given the Information that...Ch. 14 - Prob. 14.21QAPCh. 14 - Mixing the chelating reagent B with Ni(II) forms...Ch. 14 - Prob. 14.23QAP
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 solution containing the complex formed between Bi(III) and thiourea has a molar absorptivity of 9.32 x 103 M-1 cm-1 at 470 nm. (a) Calculate the absorption of a 4.25x10-5 M solution of the complex at 470 nm in a 1-cm cell. (b) What is the molar concentration of the complex in a solution that has the calculated absorption in (a) when measured at 470 nm in a 2.50 cm cell?arrow_forwardPd(II) and Au(II) can be determined simultaneously by the reaction with methiomeprazine (C 19 H 24 N 2 S 2 ). The maximum absorption for Pd occurs at 480 nm, while for the Au complex it is at 635 nm. A sample of 25 mL was treated with excess of the complexant and then diluted to 50.0 mL. Calculate the molar concentrations of Pd(II) and Au(II) in the sample. The data are found in the table below and the bucket used was 1.0 cm.arrow_forwardThe UV-vis. absorption spectrum of an aqueous solution of [Mn(OH2)6]2* displays a large number of d-d absorption bands in the visible region (all ɛ < 0.1 M-1 cm-1). i) Determine the Russell-Saunders ground state term for the Mn(II) free ion. Show your working. ii) Write down the selection rules that govern electronic transitions. iii) With reference to part ii), explain the magnitude of the molar absorption coefficients for [Mn(OH2)6]2*. To illustrate your answer, show that one of the excited state terms for Mn(II) free ion is 4G.arrow_forward
- (c) Aqueous solutions of Co2+ salts are pale pink. They contain the complex ion [Co(H₂O)]2+. Addition of concentrated HCl results in a profound colour change to dark blue, due to formation of [CoC14]. The main absorption bands of [Co(H₂O)6]2+ and [CoC14] occur at 19400 cm¹ (~10 M¹ cm') and 14700 cm¹ (~ 1000 M¹ cm¹), respectively. (i) Explain the difference in the transition energies between the two complexes. (ii) Explain why the absorption band of [CoC14]² is much more intense than that of [Co(H2O)%]2+. (d) Calculate the ligand field stabilisation energy of the following complexes: (i) [Mn(H₂O)6]2+ (ii) [Fe(CN)6]³ (iii) [CoC14]²-arrow_forwardLooking at a d6 Tanabe-Sugano diagram needed to assign the electronic transistion that corresponds to (lambda)max off 550 nm. Give that the Racah parameter for the iron complex in this complex is 848 cm^-1, determine the lighand field parameter in cm^-1 for the complex in the spin-state associated with lambda max. complex: [Fe(NH2trz)3]Cl2·2H2Oarrow_forwardAmong the following analytical methods, select all methods that candetermine the concentration and describe how each method candetermine the concentration. - Raman spectrometry- IR spectrometry- UV/vis spectrometry- Mass spectrometry- Atomic emission spectroscopy- Atomic absorption spectroscopyarrow_forward
- (c) By means of appropriate diagrams deduce which compound, potassium hexabromovanadate(III) or hexaamminecopper(II) nitrate is less affected by a magnetic field.arrow_forwardMercury(II) forms a 1:1 complex with triphenyltetrazolium chloride that exhibits an absorption maximum at 255 nm. The mercury(II) in a soil sample was extracted into an organic solvent containing an excess of TTC , and the resulting solution was diluted to 100.0 mL in a volumetric flask. Five-milliliter aliquots of the analyte solution were then transferred to six 25-mL volumetric flasks. A standard solution was then prepared that was 5*10^-6 M in . Volumes of the standard solution shown in the table were then pipetted into the volumetric flasks, and each solution was then diluted to 25.00 mL. The absorbance of each solution was measured at 255 nm in 1.00-cm quartz cells. Please solve and explain these questions: A.) Enter the given data pictured above into a spreadsheet and show the correct standard additions plot B.) Determine the slope and the intercept of the line C.)Determine the standard deviation of the slope and the intercept. D.) Calculate the concentration of Hg(II) in the…arrow_forwardPalladium (II) and gold (III) can be analyzed simultaneously through reaction with methiomeprazine (C19H24N2S2). The absorption maximum for the Pd complex occurs at 480 nm, while that for the Au complex is at 635 nm. Molar absorptivity data at these wavelengths are Molar Absorptivity, ε 480 nm 635 nm Pd complex 3.55 × 103 5.64 × 102 Au complex 2.96 × 103 1.45 × 104 A 25.0-mL sample was treated with an excess of methiomeprazine and subsequently diluted to 50.0 mL. Calculate the molar concentrations of Pd(II), CPd, and Au(III), CAu, in the sample if the diluted solution had an absorbance of 0.533 at 480 nm and 0.590 at 635 nm when measured in a 1.00-cm cell. explain each steparrow_forward
- For a luminescent lanthanide complex, a large "q" suggests that the luminescence lifetime of the complex will be relatively short. * O True O Falsearrow_forwardThe absorbance values observed during the determination of the complex stoichiometry with the Job method using the spectroscopic method were plotted and the following correct equations were obtained. What is the n value of the compound formed by Fe + 3 and SCN- ions? 1. Line equation: y = 2.6188x + 0.1608 2. Line equation: y = -2.5963x + 2.7203 a) 1 b) 3 c) 0.5 d) 2 e) 5arrow_forwardDiscuss the difference between Ligand-to-Metal Charge Transfer and Metal-to-Ligand Charge Transfer transitions.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage Learning
Principles of Modern Chemistry
Chemistry
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:Cengage Learning