27. Solving a chemistry problem

1. V ml of wastewater was placed in two volumetric flasks with a capacity of 100 ml. 10 ml of a standard CuSO4 solution (T(Cu) = 0.001000) was added to one flask. Ammonia solutions were introduced into both flasks. Rubeanic acid and diluted to the mark with water. When photographing solutions, the optical densities Ax and Ax st. were obtained.
Determine the concentration (g/l) of copper in wastewater for the following options:
1)V,ml = 10; Ax = 0.240; Ah st = 0.380
Answer: 1) 1.71 g/l;