99. Solving a chemistry problem

4. Equal volumes of wastewater V containing copper were poured into two 100 ml volumetric flasks. The required amounts of ammonia and solutions of rubeonic acid were also introduced there. 10.00 ml of a standard solution of copper sulfate (T CuSO4/Cu = 0.001) was added to one of the flasks, the contents of both flasks were brought to the mark. After filtration, the solutions were photometered to obtain the optical density values ​​Dx and Dx st. determine the concentration of copper in wastewater (g/l) using the following data:

Options 4
V,ml 40.00
Dx 0.40
Dх st 0.54