Please help. Chem Question! Thanks.?

Posted on 2016-12-15 18:31:00 in Chemistry by MOGGY

An alloy of chemicals containing Nickel, Iron and chromium was analysed by complexiometric titration using EDTA as the titrant. The solution of the alloy was prepared by dissolving 0.7176g of Cu alloy in HalO3 and then diluting it to mark in 250 cm³.volumetric flask. A 50cm³ of this aliquot of the sample treated with pyrophosphate to mask the iron and chromium, Fe & Cr requires 26.14cm³ of 0.05831M EDTA to reach the end point with murecyde as the indicator. In the second titration, 50cm³ of the aliquot treated with hexamethylene tetra amine to mask chromium requires 35.43cm³ of 0.05831M EDTA to reach the end point. Finally, a 3rd 50cm³ aliquot was treated with 50cm³ of 0.05831M EDTA and back titrated with 6.21cm³ of 0.06316M of Cu²+ to reach the end point with murecyde as the indicator. Calculate the percentage weight of Nickel, Iron and Chromium in the alloy. 

 

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