29. The optical density of a 0.001 M potassium dichromate solution in a cuvette with a layer thickness of 1.0 cm at 410 nm is 1.15, at 675 nm - 0.11. The optical densities of a 0.05 M copper sulfate solution under the same conditions are 0.15 and 1.40, respectively. A weighed sample of 4.45 g of a mixture containing these salts was dissolved in 500 ml of water and from 10 ml of the solution, after dilution to 100 ml, a solution was obtained whose optical densities at the above wavelengths were 2.40 and 0.65. Determine the content of salts in the mixture. What error would have been made in these determinations if the optical density of copper sulfate at 410 nm and potassium dichromate at 675 nm had not been taken into account?

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