Answer to Question #290263 in Chemistry for garry

Question

Calamine, which is used for relief of skin irritations, is a mixture of zinc and iron oxides. A 1.056-g sample of dried calamine was dissolved in acid and diluted to 250.0 mL. Potassium fluoride was added to a 10.00-mL aliquot of the diluted solution to mask the iron; after suitable adjustment of the pH, Zn²⁺ consumed 38.37 mL of 0.01133 M EDTA. A second 50.00-mL aliquot was suitably buffered and titrated with 2.30 mL of 0.002647 M ZnY^2– solution:

 

Fe³⁺ + ZnY^2-      FeY^- + Zn²⁺

 

Calculate the percentage of ZnO and Fe₂O₃ in the sample. 

Answer 1

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