101. Determine the concentration of palladium (mol / l)

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101. Determine the concentration of palladium (mol / l) in the solution if, when analyzing 50 ml of the test solution by the method of additives, a wave height of 12.5 mm was obtained, and after adding 2.5 ml of a standard solution with a concentration of 0.02 mol / l, the wave height increased to 26 mm.