A standard solution with a FeSCN2+ concentration of 1.55x10^-4M has a percent transmittance (%T) of 18.8%. Another solution of unknown FeSCN2+ concentration has a percent transmittance of 44.8%.

A) Calculate the absorbance (A) of each solution.
B) Using the absorbances calculated in 1a, calculate the FeSCN2+ concentration of the unknown solution.

1 answer

A = log 1/T

Use A1 = kc1. Substitute A1 and c1 and solve for k.
Then A2 = kc2. Substitue A2 and k and solve for c2.