The absorbance of a solution is related to its concentration by the **Beer-Lambert law**.

$\overline{){\mathbf{A}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}{\mathbf{\epsilon bc}}}$

**Where,**

A = absorption

ε = molar absorptivity

b = path length of solution

c = molar concentration

We have the following data for solution A:

A = 0.572

b = 1.0 cm

ε = 1.21 x 10^{4} M^{-1} cm^{-1}

**c = concentration**

A student finds a solution of blue dye #2 (another food dye we are not using in this lab) in a 1.0 cm cuvette has a maximum absorbance of 0.572 at 613 nm. The molar extinction coefficient, E, of blue #2 at the same wavelength is 1.21 x 10^{4} M^{-1} cm^{-1}. Calculate the concentration of this solution.

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