Question: The working curve data for determining Fe as a complex was as follows: Fe, ppm 0.209 0.417 0.626 0.835 1.044 Absorbance 0.132 0.246 0.487 0.560

The working curve data for determining Fe as a complex was as follows:

Fe, ppm 0.209 0.417 0.626 0.835 1.044

Absorbance 0.132 0.246 0.487 0.560 0.742

Use a hand calculator, STAT mode, to obtain (i) the calibration curve, assuming a straight-line model. (ii) What would be the % wt of Fe in a sample that was prepared as follows: 45.8 mg sample was dissolved in 5 mL conc. HCl, and then made to 50.0 mL in a volumetric flask (soln A). From soln A, 1.00 mL was diluted to 25.0 mL volumetric flask (solution B). Then, 10.0 mL aliquot, of solution B was complexed for coloration, and diluted to a total volume of 25.0 mL. Its absorbance was 0.235 AU. Fe = 55.85 g/mol.

NOTE: I keep getting a mass for Fe that is greater than the total mass of the sample, and I am not sure why. Any help would be appreciated!

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