99. Solving a chemistry problem

5. To determine the content of nitrite and nitrate ions in an aqueous solution, we measured the optical densities of standard solutions of KNO2 and KNO3 at wavelengths of 302 and 355 nm in quartz cuvettes with l = 1,000 cm and obtained the results presented in Table 1. Calculate the concentrations of nitrite and nitrate ions in the analyzed solution, if when measuring it under the same conditions A302 = 1.055 A355 = 0.805
Parameter KNO2 KNO3
C, mg/ml 0.5 1.0 1.5 2.0 1.0 3.0 5.0 7.0
A302 0.102 0.202 0.305 0.405 0.117 0.350 0.583 0.817
A355 0.254 0.506 0.760 1.01 - - -