Question

What is the concentration of a copper (II) sulfate solution if its absorbance is measured to be 0.25 using a spectrophotometer with a 1 cm cuvette and a wavelength of 620 nm, assuming a molar absorptivity of 5,400 M^-1cm^-1?

Answer 1

To calculate the concentration of the copper  II  sulfate solution, we can use the Beer-Lambert Law, which states:A =  * c * lWhere:A = absorbance  0.25  = molar absorptivity  5,400 M^-1cm^-1 c = concentration  unknown l = path length of the cuvette  1 cm Rearranging the equation to solve for the concentration  c :c = A /   * l Now, plug in the given values:c = 0.25 /  5,400 M^-1cm^-1 * 1 cm c = 0.25 / 5,400c = 0.0000463 MSo, the concentration of the copper  II  sulfate solution is approximately 0.0000463 M or 46.3 M.