Question

An unknown solution of triiodide registers an absorbance of 0.782 at 362 nm. A series of triiodide solutions of known concentration were analyzed at this wavelength and a standard curve was created. The equation of the best fit line from the standard curve was determined to be A = (3.2 x 10^-1 M^-1)c, where A= absorbance and c is the concentration of the solution. The constant value in this equation is the value of el. What is the concentration of the triiodide in the unknown solution?

Answer 1

The standard curve was done at the wavelength of 362 nm for uniformity. We can use this function to determine the concentration at any absorbance value. At A = 0.782, c is,

A = (3.2 x 10^-1 M^-1)c
0.782 = (3.2 x 10^-1 M^-1)c
c = 2.44 M

The concentration of the triiodide solution is 2.44 M.