145. Solving a chemistry problem

43 (2). In two volumetric flasks with a capacity of 100.00 ml was placed according to Y ml of waste water. 10.00 ml of a standard solution of CuSO4 (T (Cu) = 0.001000) was added to one flask. Ammonia solutions of rubeic acid were introduced into both flasks and diluted to the mark with water. By photometry of the solutions, optical densities of Ax and Ax + Art. Determine the concentration of g / l copper in the waste water for the following options.
Option 2
Y, ml 20.00
Ah 0.280
Ah + p 0.420