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M-17
Part IV: Unknown Solution
Unknown Water Code: ____________
1.
Absorbance of final diluted solution ___________________
2.
Concentration of Fe
x+
in the diluted sample: ________________
(estimated from the calibration curve) (0.2 marks)
3.
Concentration of the total iron in the original unknown water sample: (0.8 marks)
4.
Environmental agencies traditionally list the concentrations of the acceptable ranges of
many substances in parts per million (ppm) where 1 ppm = 1 mg
L
-1
. Calculate the
concentration in parts per million of total iron in your unknown water sample. (0.5 marks)
