3. Calculate the concentration of uranium (IV) and uranium (VI) in a concentrated solution of phosphoric acid according to the following data. The molar coefficient of light absorption at 410 nm for uranium (IV) is 2.0, and for uranium (VI) - 11; at 630 nm this coefficient is equal to 0 for uranium (IV). When measuring the test solution, optical densities were found at 410 nm - 0.50, and at 630 - 0.80. Used cuvette l = 1 cm

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