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Mn was used as an internal standard for measuring Fe by atomic absorption. A standard
Chapter 20, Problem 20-B(choose chapter or problem)
Mn was used as an internal standard for measuring Fe by atomic absorption. A standard mixture containing 2.00 g Mn/mL and 2.50 g Fe/mL gave a quotient (Fe signal/Mn signal) 1.05/1.00. A mixture with a volume of 6.00 mL was prepared by mixing 5.00 mL of unknown Fe solution with 1.00 mL containing 13.5 g Mn/mL. The absorbance of this mixture at the Mn wavelength was 0.128, and the absorbance at the Fe wavelength was 0.185. Find the molarity of the unknown Fe solution. 20
Questions & Answers
QUESTION:
Mn was used as an internal standard for measuring Fe by atomic absorption. A standard mixture containing 2.00 g Mn/mL and 2.50 g Fe/mL gave a quotient (Fe signal/Mn signal) 1.05/1.00. A mixture with a volume of 6.00 mL was prepared by mixing 5.00 mL of unknown Fe solution with 1.00 mL containing 13.5 g Mn/mL. The absorbance of this mixture at the Mn wavelength was 0.128, and the absorbance at the Fe wavelength was 0.185. Find the molarity of the unknown Fe solution. 20
ANSWER:Step 1 of 4
Given that:
A standard mixture containing 
Fe signal/Mn signal = 1.05/1.00
The volume of the mixture = 6 mL
Mn wavelength is 0.128
Fe wavelength is 0.185