19. A dilute solution of copper sulfate is concentrated by passing 500 ml of this solution through a chromatographic column with H+-form cation exchanger. The copper ion is then washed out of the column with HCl solution. The eluate and washing waters are placed in a 100 ml flask, 20.00 ml of the resulting solution is taken into a 50 ml flask, 25% NH3 is added, adjusted to the mark and photometered (Aissl.). 6.0 ml of a standard CuSO4 solution with T = 0.002 g (Cu)/ml is placed in a 50 ml volumetric flask and photometered in the same way as the test solution, determining Ast. Calculate the mass of copper (mg) in the analyzed solution.
Option 1
Aissl A st
0.42 0.35

If the file does not open for you, install the Rar archiver program. Inside the archive, the solution is in WORD format.