30. Calculate the copper content in the analyzed sample, if it is known that a sample sample of 0.500 g was dissolved, quantitatively transferred into a volumetric flask with a capacity of 50 cm3, and the volume of the solution was brought to the mark with an ammonia solution. Then, 10 cm3 of this solution was taken into two volumetric flasks with a capacity of 50 cm3, 10.0 cm3 of a standard copper salt solution (T = 0.0001815) was introduced into one of the flasks. Both solutions were made up to the mark. The optical density of the solution with the additive is 0.575, without it - 0.461 when measured in a cuvette with l=2 cm and at λ=610 nm. Distilled water was used as a reference solution.

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