Concept explainers
(a)
Interpretation:
The percent transmittance of the solution for the absorbance half of
Concept introduction:
The percent transmittance of a solution is the ability of the solution to allow the monochromatic light to pass through it. The percent transmittance of a solution is the ratio of the intensity of monochromatic light incident on the solution to the intensity transmitted through the solution.
The relation between the absorbance and transmittance is established by the Beer’s law.
(b)
Interpretation:
The percent transmittance of the solution for the absorbance half of
Concept introduction:
The percent transmittance of a solution is the ability of the solution to allow the monochromatic light to pass through it. The percent transmittance of a solution is the ratio of the intensity of monochromatic light incident on the solution to the intensity transmitted through the solution.
The relation between the absorbance and transmittance is established by the Beer’s law.
(c)
Interpretation:
The percent transmittance of the solution for the absorbance half of
Concept introduction:
The percent transmittance of a solution is the ability of the solution to allow the monochromatic light to pass through it. The percent transmittance of a solution is the ratio of the intensity of monochromatic light incident on the solution to the intensity transmitted through the solution.
The relation between the absorbance and transmittance is established by the Beer’s law.
(d)
Interpretation:
The percent transmittance of the solution for the absorbance half of
Concept introduction:
The percent transmittance of a solution is the ability of the solution to allow the monochromatic light to pass through it. The percent transmittance of a solution is the ratio of the intensity of monochromatic light incident on the solution to the intensity transmitted through the solution.
The relation between the absorbance and transmittance is established by the Beer’s law.
(e)
Interpretation:
The percent transmittance of the solution for the absorbance half of
Concept introduction:
The percent transmittance of a solution is the ability of the solution to allow the monochromatic light to pass through it. The percent transmittance of a solution is the ratio of the intensity of monochromatic light incident on the solution to the intensity transmitted through the solution.
The relation between the absorbance and transmittance is established by the Beer’s law.
(f)
Interpretation:
The percent transmittance of the solution for the absorbance half of
Concept introduction:
The percent transmittance of a solution is the ability of the solution to allow the monochromatic light to pass through it. The percent transmittance of a solution is the ratio of the intensity of monochromatic light incident on the solution to the intensity transmitted through the solution.
The relation between the absorbance and transmittance is established by the Beer’s law.
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Chapter 13 Solutions
PRINCIPLES OF INSTRUMENTAL ANALYSIS
- An aqueous solution of a Ni2+ complex with a concentration of 8.61 × 10–5 M was analyzed by a UV-VIS spectrometer at 470 nm and in a 1.00-cm cell; a percent transmittance value of 78.70% was recorded. What is the absorbance of the solution? * Provide your answer with three decimal places and without units. Avoid using scientific notation.arrow_forwardShow COMPLETE solutions. Round-off FINAL answer to the 4th decimal The absorption coefficient of Sample Z at 340 nm is 600 Mol-1cm-1. What absorbance will be observed when light at 340 nm passes through a 1 cm cuvette containing 0.001M Sample zk A solution put in a 1.5 cm container transmits 55% incident light. Calculate the concentration of the solution, given that ɛ = 6x10-3 Mol-1cm-1. A solution shows a transmittance of 39.72%, when taken in a container measuring 3.5 cm thickness. Calculate its concentration, if the molar absorption coefficient is 3x10-2 Mol-1cm- 1.arrow_forwardIn a 1.00 cm cell, a colored solution transmits 40.0% of the incident light that passed through it. ε = 4.52 x 10³ Lmol-¹cm-¹. Determine absorbance of the solution 0.398 0.220 60.00 0.400arrow_forward
- A particular food coloring has a molarabsorptivity of 3.8*10 3 cm -1 M -1 at 510nm. What will be the absorbance of a 2*10-4M solution in 1 -cm cuvette at 510 nm? What will be the percent transmittance of thesolution in (a)?arrow_forwardBriefly explain why it is NOT accurate to calculate the concentration of a sample whose absorbance is 0.185 using the equation y=0.0022x+0.0005 r^2=0.999arrow_forwardThe absorbance of 1.48x 105 M methyl red solution, prepared in 0.1 M HCI, was measured using a 1.0 cm cell (cuvette) and found to be 0.550 at 524 nm. Calculate the molar absorption of methyl red under these conditions. Select one: 42956 M¹ cm-¹ < 18524 M²¹ cm 1 O37162 M.¹ cm ¹ 12760 M¹¹cm¹arrow_forward
- At 350 nm, the absorbance of a solution of 60.06-ppm K2Cr207 in 0.0050 M H2SO, in 0.640 (b=1). What is the molar absorbitivity of K2Cr207 at this wavelength?arrow_forward.Q1. To determine the concentrations (mol/L) of Co(NO3)2 (A) and Cr(NO3)3(B) in an unknown sample, the following representative absorbance data wereobtained.A (mol/L) B (mol/L) 510nm 575nm5×10−1 0 0.714 0.0970 6×10−2 0.298 0.757Unknown Unknown 0.671 0.330Measurements were made in 1.0 cm glass cells.i. Calculate the four molar absorptivities: ∈A(510), ∈A(575), ∈B(510) and ∈B(575).ii. Calculate the molarities of the two salts A and B in the unknown.arrow_forwardWhat is the absorbance of a solution if it had 79.5% transmittance?arrow_forward
- A student mixed 5.00mL of 0.0020M Fe(NO3)3, 3.00mL of 0.0020M KSCN, and 3.00mL of distilled water. The mixture reacted to form a reddish solution indicating that FeSCN2+ was formed, according to the equation below. An absorbance of 0.21 was measured for this solution in a Spectrophotometer set at a wavelength of 447nm. Fe³+ (aq) + SCN (aq) FeSCN2+ (aq) A calibration curve was used to find the equilibrium concentration of the product of this reaction: y = 1895x + 0.027 Calculate the equilibrium concentration of the Fe³+ Report your answer to 4 sig figsarrow_forwardextinction coefficient = ε, path length = b, concentration C A sample containing an unknown concentration of FeCl3 is measured to have an absorbance of 0.43 at 334 nm in a 1.0 cm cuvet. What is the molar concentration of the solutionarrow_forwardThe molar absorptivity of a colored solution with a concentration of 0.0222M was determined to be 22.88 M-1•cm-1. Calculate the absorbance of the solution if the path length is 1.00 cm.arrow_forward
- Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks ColePrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning