A compound with a molecular mass of 292.16 g/mol was dissolved in a 5-mL volumetric flask....
A compound with a molecular mass of 292.16 g/mol was dissolved
in a 5-mL volumetric flask. A 1.00-mL aliquot was withdrawn, placed
in a 10-mL volumetric flask, and diluted to the mark. The
absorbance at 340 nm was 0.427 in a 1.00-cm cuvette. The molar
absorptivity at 340 nm is ε340 = 6130 M-1
cm-1.
(a) Calculate the concentration of the compound in the
cuvette.
(b) What was the concentration of the compound in the 10-mL
volumetric flask and the 5-mLvolumetric flask?
(c) How many milligrams of compound were used to make the 5-mL
solution?
Homework Answers
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A compound with a molecular mass of 292.16 g/mol was dissolved
in a 5-mL volumetric flask....
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C. Problems 1Explain the difference between transmittance, absorbance, and molar absorptivity Which one is proportional to concentration? 2. The absorbance of a 2.3lx 10 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00 cm cell. Calculate the molar absorptivity at 266 nm 3. A compound with a molecular weight of 292.16 was dissolved in a 5-ml volumetric flask. A 1.00-mLaliquat was withdrawn, placed in a 10-mL volumetric flask, and diluted to the mark....
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An unknown amount of a compound with a molecular mass of 270.93 g/mol is dissolved in...
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C. Problems 1Explain the difference between transmittance, absorbance, and molar absorptivity Which one is proportional to concentration? 2. The absorbance of a 2.3lx 10 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00 cm cell. Calculate the molar absorptivity at 266 nm 3. A compound with a molecular weight of 292.16 was dissolved in a 5-ml volumetric flask. A 1.00-mLaliquat was withdrawn, placed in a 10-mL volumetric flask, and diluted to the mark....
An unknown amount of a compound with a molecular mass of 294.46 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and enough water is added to dilute to the mark. The absorbance of this diluted solution at 343 nm is 0.456 in a 1.000 cm cuvette. The molar absorptivity for this compound at 343 nm is €343 = 5721 M-?cm-1. What is the concentration...
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need help on these
Suppose you obtained the following data from two standard solutions of known concentrations using a UV-Vis spectroscope: Analysis # Conc. (mg/L) 8.00 20.00 Absorbance (at 255 nm) 0.160 0.390 What is the concentration (in mg/L) of an unknown solution with an absorbance of 0.200 at 255 nm 10 points)? The unknown solution contains the same analyte as the standard solution does (Assume a path length of 1cm). 10. You prepared a stock solution by dissolving a...
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