I've been trying to figure this one out for more than a day now, and can't seem to get it:
The UV-VIS absorbance of a solution of 1.000X10^-3 M K2Cr2O7 was 0.020 and 0.005 at 450nm and 530nm, respectively. A solution of 1.000X10^-4 M KMnO4 did not absorb at 450nm, while its absorbance at 530nm was 0.042. The UV-VIS TRANSMITTANCE of a mixture solution of K2Cr2O7 and KMnO4 was measured to be 0.500 and 0.250 at 450nm and 530nm, respectively. There are no other compounds in the solution. Find the concentration of potassium ion (K+) in the mixture. A 0.100cm quartz cuvette was used.
Thank you!