Question

What is the concentration of a solution containing CuSO4 if its absorbance is 0.472 at a wavelength of 620 nm? The molar absorptivity of CuSO4 at this wavelength is 2.34 x 10^4. The solution has a path length of 1 cm.

Answer 1

To find the concentration of the CuSO4 solution, we can use the Beer-Lambert Law, which states:A =  * c * lwhere A is the absorbance,  is the molar absorptivity, c is the concentration, and l is the path length.We are given the absorbance  A = 0.472 , the molar absorptivity   = 2.34 x 10^4 , and the path length  l = 1 cm . We need to solve for the concentration  c .Rearranging the equation to solve for c, we get:c = A /   * l Now, plug in the given values:c = 0.472 /  2.34 x 10^4 * 1 c = 0.472 / 2.34 x 10^4c  2.017 x 10^-5 MThe concentration of the CuSO4 solution is approximately 2.017 x 10^-5 M.