Calamine, which is used for the relief of skin irritations, is a mixture of zinc and iron
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Calamine, which is used for the relief of skin irritations, is a mixture of zinc and iron oxides. A 1.022-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 38.71 mL of 0.01294 M EDTA. A second 50.00-mL aliquot was suitably buffered and titrated with 2.40 mL of 0.002727 M ZnY2− solution:
Calculate the percentages of ZnO and Fe2O3 in the sample.
Related Book For
Fundamentals of Analytical Chemistry
ISBN: 978-0495558286
9th edition
Authors: Douglas A. Skoog,Donald M. West, F. James Holler, Stanley R. Crouch
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