Spectrochemical Analysis Methods
Given the molar absorptivity data for cobalt complex with 2,3-quinoxalinedithiol (QT) and QDT at 510 nm are:
eCo = 36400 and egoT = 250 (at 510 nm)
A 0.515 g sample was dissolved and diluted to 50.0 mL. A 20.0 mL aliquot was treated and QDT was added (with an excess QDT of 1x 10-4 M). The final volume was then adjusted to 50.0 mL. This
solution has an absorbance of 0.371 at 510 nm in a 1.0 cm cell.
Determine (a) the molar concentrations of cobalt in the diluted solution and (b) the concentration in ppm of cobalt in the sample. (Molecular weights of cobalt = 58.93)
(Hint. (metal)in ppm = (g metal/g sample) x 10°)
Homework Answers
Request Answer!
We need at least 10 more requests to produce the answer.
0 / 10 have requested this problem solution
The more requests, the faster the answer.
Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are = 364...
Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are = 36400 and = 5520 at 510 nm and = 1240 and = 17500 at 656 nm. A 0.389-g sample was dissolved and diluted to 50.0 mL. A 25.0-mL aliquot was treated to eliminate interferences; after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution had an absorbance of 0.487 at 510 nm and 0.268 at 656 nm in a 1.00-cm cell. Calculate the concentration...
Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are = 36400 and =...
Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are = 36400 and = 5520 at 510 nm and = 1240 and = 17500 at 656 nm. A 0.389-g sample was dissolved and diluted to 50.0 mL. A 25.0-mL aliquot was treated to eliminate interferences; after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution had an absorbance of 0.487 at 510 nm and 0.268 at 656 nm in a 1.00-cm cell. Calculate the concentration...
Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are εco=36,400 and εNi=5520 at...
Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are εco=36,400 and εNi=5520 at 510 nm and εco=1240 and εNi=17,500 at 656 nm. A 0.519 g sample was dissolved and diluted to 50.0 mL. A 25.00 mL aliquot was treated to eliminate interferences; after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. The solution has absorbances of 0.477 at 510 nm and 0.219 at 656 nm in a 1-cm cell. Calculate the concentration in parts per...
Ligand X forms a complex with both cobalt and copper, each of which has a maximum...
Ligand X forms a complex with both cobalt and copper, each of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.241 g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution containing ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. The measured absorbance of the unknown solution was 0.447 at 510 nm and...
Ligand X Forms.... Ligand X forms a complex with both cobalt and copper, each of which...
Ligand X Forms....
Ligand X forms a complex with both cobalt and copper, each of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.238-g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution containing ligand X was added to a 50.0 ml_ aliquot of the sample solution and diluted to a final volume of 100.0 mL. The measured absorbance of the unknown solution was 0.497 at 510...
A 5.00-mL aliquot of a solution that contains 2.01 ppm Fe2+ is treated with an appropriate...
A 5.00-mL aliquot of a solution that contains 2.01 ppm Fe2+ is treated with an appropriate excess of thiocyanate and diluted to 50.0 mL. The molar absorptivity of a Fe2+-thiocyanate solution at 580 nm is 7000 L mol-1 cm-1. What is the absorbance of the above diluted Fe2+-thiocyanate solution at 580 nm in a 10.00-cm cell?
Please help! Ligand X forms a complex with both cobalt and copper, cach of which has...
Please help!
Ligand X forms a complex with both cobalt and copper, cach of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.217 g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution containing ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. The measured absorbance of the unknown solution was 0.493 at 510...
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and...
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and diluted to the exact 100 mL mark in a volumetric flask. Two 20.0 mL samples of this solution were taken. In the first sample, a Cr-EDTA complex is developed and sufficient water is added to give a total volume of 100.0 mL. In the second sample, 10.0 mL of Cr(III) standard solution at to concentration of 15 mM was added before developing the Cr-EDTA...
A standard solution of iron was made by weighing 0.075 g of Fe(NH4)2(SO4)2 6(H2O) in 250...
A standard solution of iron was made by weighing 0.075 g of Fe(NH4)2(SO4)2 6(H2O) in 250 mL. Aliquots of this standard solution (see below) were transferred to a 100 mL volumetric flask, pH adjusted with citrate, and reacted with hydroquinone and o-phenanthroline and diluted to volume (100 mL). The absorbance was measured in a 1.0-cm cell using a Genesys 20 Spectrophotometer at 508 nm: Aliquot of standard solution Absorbance 1.0 mL 0.079 2.0 mL 0.163 5.0 mL 0.413 10.0 mL...
Please I need Answers for ALL THESE QUESTIONS with explanation 2 A solution containing 52.4 mg/100ml...
Please I need Answers for ALL THESE QUESTIONS with
explanation
2 A solution containing 52.4 mg/100ml of B (335 g/mole) has a transmittance of 45.2% in a 1.0 cm cell at 400nm. Calculate the "ABSORPTIVITY" of "B" at this wavelength Inna m L v inole -,.С/.x103 i-moll A Iron is treated with excess color 3.A 2.5ml aliquot of a solution containing 7.9ppm reagent to give a colored "Complex-product"; this was then diluted to 50ml with buffer. is 7,000 L/Mol/cm、.rm /つのフ...
Ligand X forms a complex with both cobalt and copper, each of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.241 g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution containing ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. The measured absorbance of the unknown solution was 0.447 at 510 nm and...
Ligand X Forms....
Ligand X forms a complex with both cobalt and copper, each of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.238-g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution containing ligand X was added to a 50.0 ml_ aliquot of the sample solution and diluted to a final volume of 100.0 mL. The measured absorbance of the unknown solution was 0.497 at 510...
Please help!
Ligand X forms a complex with both cobalt and copper, cach of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.217 g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution containing ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. The measured absorbance of the unknown solution was 0.493 at 510...
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and diluted to the exact 100 mL mark in a volumetric flask. Two 20.0 mL samples of this solution were taken. In the first sample, a Cr-EDTA complex is developed and sufficient water is added to give a total volume of 100.0 mL. In the second sample, 10.0 mL of Cr(III) standard solution at to concentration of 15 mM was added before developing the Cr-EDTA...
Please I need Answers for ALL THESE QUESTIONS with
explanation
2 A solution containing 52.4 mg/100ml of B (335 g/mole) has a transmittance of 45.2% in a 1.0 cm cell at 400nm. Calculate the "ABSORPTIVITY" of "B" at this wavelength Inna m L v inole -,.С/.x103 i-moll A Iron is treated with excess color 3.A 2.5ml aliquot of a solution containing 7.9ppm reagent to give a colored "Complex-product"; this was then diluted to 50ml with buffer. is 7,000 L/Mol/cm、.rm /つのフ...
Most questions answered within 3 hours.
-
The following information for the past year is available from
Thinnews Co., a company that uses...
asked 20 seconds ago -
Suppose you work for Allstate, and insurance company and the
data shows the following for auto...
asked 21 seconds ago -
The fresh fruit market and frozen dinner market are
currently in equilibrium. Fresh fruit is a...
asked 5 minutes ago -
(1 point) Golf-course designers have become concerned that old
courses are becoming obsolete since new technology...
asked 3 minutes ago -
The active retelling of dominant cultural stories is known
preserves which concept?
hegemony
heterodoxy
doxa
myth
asked 7 minutes ago -
1. Which of the following statements is true of money?
It is anything accepted in exchange...
asked 7 minutes ago -
BASED ON THE AIRBNB, ETSY, UBER: GROWING FROM ONE THOUSAND TO
ONE MILLION CUSTOMERS HARVARD CASE:...
asked 33 minutes ago -
Which of these methods cause sterilization?
Autoclaving
Dry heat
Gamma irradiation
Ethylene oxide
A.
Yes
No...
asked 39 minutes ago -
A biologist wishes to estimate the effect of an antibiotic on
the growth of a particular...
asked 47 minutes ago -
O’Deesha Company has the following information available:
Quality engineering of
products
$20,000
Quality training of
employees &n
asked 55 minutes ago -
a) Draw two water molecules.
b) Clearly name and label the type of bond that exists...
asked 2 hours ago -
C - Language
Write a loop that sets each array element to the sum of itself...
asked 3 hours ago