for the lab of SPECTROPHOTOMETRIC DETERMINATION OF IRON USING 1,10 PHENANTHROLINE %Fe= c unknown(mol/L) X 1L X 80...

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Chemistry

for the lab of
SPECTROPHOTOMETRIC DETERMINATION OF IRON USING 1,10PHENANTHROLINE
%Fe= c unknown(mol/L) X 1L X 80 X Molarmass Fe(g/mol)Â Â X100%
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Mass of Sample (g)

I am confused about how to find the concentration of theunknown

In this method equal volumes of the unknown are pipetted intoseveral volumetric flasks. Then increasing volumes of the standardare added to each flask and each is diluted to the same finalvolume. Every flask now contains the same concentration of unknownand different concentrations of standard. (Remember that thestandard is the same substance as the unknown). For each flask, ameasurement of analytical signal is then made. The equation of theline is y= mx + b, where the x-intercept (the concentration of theunknown) is calculated from the expression x=âˆ’b/m

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Answer & Explanation Solved by verified expert

4.3 Ratings (895 Votes)

You should have provided the data would have been easier to show you the calculations However I will show you a qualitative treatment You are following the method of standard addition because the given sample contains the analyte your molecule of interest in such a small concentration that it cannot be detected spectrophotometrically You add the analyte your molecule of interest standard See Answer

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