I was able to correctly find that the slope of the line is 0.167 and that the in

Question

I was able to correctly find that the slope of the line is 0.167 and that the intercept is 0.0783. But then it asks..... You next add 50 mL of your unknown sample to a 100 mL volumetric flask, treat it with hydroxylamine, o-phenanthroline, and citrate as described above, dilute to the mark, and determine the absorbance of the diluted sample to be 0.788. What is the concentration of Fe in your unknown?

Fe Conc. Absorbance (ppm) 0.50 1.0 2.0 3.0 4.0 5.0 0.118 0.272 0.471 0.560 0.699 0.938 Use this graph to answer the following questions: The equation for the line is in the form "y = mx + b", where m is the slope, and b is the intercept.

Explanation / Answer

Absrobance= 0.167* concentration+ 0.0783

0.788-0.0783= 0.167* concentration

concentration =4.249 ppm

this is present in 100ml of diluted sample

original sample contains 4.249*100/50= 4.249*2=8.498 ppm of Fe

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