5. Solution to Chemistry Problem
33. A 0.2500 g sample of zirconium-containing ore was transferred to a solution and the volume was brought to 25.0 ml. Then 2.0 ml of this solution was placed in a 25.0 ml volumetric flask, morin was added and the fluorescence intensity was measured. It was equal to 35 conventional units. The standard solution of zirconium-morin complex, containing 2 μg of zirconium in 25.0 ml, has a fluorescence of 70 conventional units. An excess of EDTA was added to both solutions, suppressing the fluorescence of the zirconium-morin complex. The residual fluorescence for the analyzed solution is 3 conventional units, and for the standard solution it is 4 conventional units. Calculate the mass fraction (ω,%) of zirconium in the ore.
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