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, consumed 31.45 mL of 0.01133 M EDTA. A second 50.00-mL aliquot was suitably buffered and titrated with 2.29 mL of 0.002647 M solution:

Fe3+ + ZnY2- → FeY- +Zn2+

Required:
Calculate the percentages of ZnC and Fe2C3 in the sample.

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answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

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