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{"ops":[{"insert":"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, Zn"},{"attributes":{"script":"super"},"insert":"2+"},{"insert":" 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"},{"attributes":{"script":"super"},"insert":"2\u2013"},{"insert":" solution: \n\u00a0\n\tFe"},{"attributes":{"script":"super"},"insert":"3+"},{"insert":" + ZnY"},{"attributes":{"script":"super"},"insert":"2-"},{"insert":"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FeY"},{"attributes":{"bold":true,"script":"super"},"insert":"-"},{"insert":" + Zn"},{"attributes":{"script":"super"},"insert":"2+"},{"insert":"\n\t"},{"attributes":{"script":"super"},"insert":"\u00a0"},{"insert":"\nCalculate the percentage of ZnO and Fe"},{"attributes":{"script":"sub"},"insert":"2"},{"insert":"O"},{"attributes":{"script":"sub"},"insert":"3"},{"insert":" in the sample.\u00a0\n"}]}

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