A chemist prepared a reagent blank and 6 Fe standards with the following concentrations: 20, 30, 40, 50, 60, and 70 ppm. The table below shows the average reading of each run in the UV-Vis spectrophotometer. Concentration (ppm)------------------------Absorbance (au) 20--------------------------------------------------0.121 30--------------------------------------------------0.302 40--------------------------------------------------0.468 50--------------------------------------------------0.573 60--------------------------------------------------0.696 70--------------------------------------------------0.845 Blank----------------------------------------------0.04 Which of the following is the correct equation for the calibration curve?
A chemist prepared a reagent blank and 6 Fe standards with the following concentrations: 20, 30, 40, 50, 60, and 70 ppm. The table below shows the average reading of each run in the UV-Vis spectrophotometer.
Concentration (ppm)------------------------Absorbance (au)
20--------------------------------------------------0.121
30--------------------------------------------------0.302
40--------------------------------------------------0.468
50--------------------------------------------------0.573
60--------------------------------------------------0.696
70--------------------------------------------------0.845
Blank----------------------------------------------0.04
Which of the following is the correct equation for the calibration curve?
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