A standard iron solution was prepared by dissolving 0.0140 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.214 in a 1.00 cm cuvette. A 0.128 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to the mark with water. A 1.00 mL aliquot of the sample was transferred to a 25.00 mL volumetric flask, and diluted to the mark with water. A portion of the diluted sample was then transferred to a 1.00 cm cuvette and measured at a wavelength of 540 nm. The resulting absorbance was 0.216. Determine the % w/w of Fe in the iron ore.
A standard iron solution was prepared by dissolving 0.0140 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.214 in a 1.00 cm cuvette. A 0.128 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to the mark with water. A 1.00 mL aliquot of the sample was transferred to a 25.00 mL volumetric flask, and diluted to the mark with water. A portion of the diluted sample was then transferred to a 1.00 cm cuvette and measured at a wavelength of 540 nm. The resulting absorbance was 0.216. Determine the % w/w of Fe in the iron ore.
Chapter26: Molecular Absorption Spectrometry
Section: Chapter Questions
Problem 26.15QAP
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Transcribed Image Text:A standard iron solution was prepared by dissolving 0.0140 g of pure
iron in acid then transferring to a 50.00 mL volumetric flask with
orthophenanthroline as a complexing agent. At a wavelength of 540 nm,
the absorbance of the standard was 0.214 in a 1.00 cm cuvette. A 0.128
g sample of an iron ore was crushed and digested in 5 mL of
concentrated acid. The digested sample was then transferred to a
10.00 mL volumetric flask and diluted to the mark with water. A 1.00
mL aliquot of the sample was transferred to a 25.00 mL volumetric
flask, and diluted to the mark with water. A portion of the diluted
sample was then transferred to a 1.00 cm cuvette and measured at a
wavelength of 540 nm. The resulting absorbance was 0.216. Determine
the % w/w of Fe in the iron ore.
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