Answer to Question #213278 in Inorganic Chemistry for Pie

Question

Five standard chromium(VI) solutions were prepared through serial dilution technique with corresponding absorbance readings at 540 nm wavelength as follows:

Concentration Absorbance

A₁=0.650            C₁=1.9  ppm

A₂=0.712            C₂=4.0  ppm

A₃=1.370            C₃=6.0  ppm

A₄=2.050            C₄=8.0  ppm

A₅=3.423            C₅=10.0 ppm

The sample solution gives an average absorbance reading of 0.713. What is then the concentration of chromium (VI) ion in the sample?

Answer 1

Concentration of chromium (VI) ion=2.67