Solving a chemistry problem
75. A weighed portion of a phosphor weighing 2.026 g, consisting of cadmium and zinc sulfides, was dissolved in a 100.0 ml volumetric flask. From 20.08 ml of the resulting solution, ZnNH4PO4 and CdNH4PO4*H2O were precipitated and after calcination, 0.6227 g of a mixture of Zn2P2O7 and Cd2P2O7 pyrophosphates was obtained. Calculate the mass fractions (%) of CdS and ZnS in the phosphor.
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