Question

Question (4 a) A sample that contains a known concentration of potassium permanganate KMn04, showed the following reading, what is the absorption maxima a Absorption vs. Wavelength for Maximum Absorbance Determination Wavelength (nm) 15 Marks ",.01 E. , ET ET. 81. EV. EA. ,YoT 0.373 0.515 0.671 0.842 0.961 1.063 0.991 0.971 0.657 0.612 0.357 0.161 0.127 0.105 er. OA. 09. ) The determination of Fe in an industrial waste was carried out by using o- phenanthroline using the following table determine mg Fe/l in the waste stream mg Fe 1 0.0 1.00 2.00 3.00 4.00 absorbance 0.0000 0.183 0.364 0.546 0.727 0 456

Answer 1

a) Place the value of λ in which the absorbance is maximum, this point occurs at an absorbance of 1.063.

b) The known values ​​of concentration versus absorbance are plotted:

mg Fe/L Absorbance 0 Absorbance 0 0,183 0,364 0,8 0,546 0,7 0,727 0,6 0,5 0,4 0,3 0,2 y 0,1817x +0,0006 4 Absorbance Lineal (Absorbance) 0 0 3 4

The equation of the line is determined, which was:

Y = 0.1817 X + 0.0006

Where X: Concentration and Y: Absorbance, clear:

X = (Y - 0.0006) / 0.1817

The concentration at absorbance of 0.456 is calculated:

X = (0.456 - 0.0006) / 0.1817 = 2.51 mg Fe / L

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