Anna Elise 91004E D Alyce 2351 Dre http://annarbor.cra, eMNM Couture 9621 0/03/1

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Anna Elise 91004E D Alyce 2351 Dre http://annarbor.cra, eMNM Couture 9621 0/03/15/2016 01:12 PM Print CalculatorPeriodic Tabie Not Set estion 5 of5 Hether Holmes at Eatem Michigan University A 50.00-mL aliquot of Cu (aq) was titrated with 0.046 M EDTA, and the absorbance was monitored. The spectrophotometric titration curve is shown here: 0.6 The equation of the best-fit line prior to the end point was y 0.076x + 0.004. The equation of the best-fit line after the end point was y =-0.006x + 0.510. o 5 10 15 20 ulune of EDTA(mIL) Number The end point volume for this titration is 0 mL EDTA Number The mass of copper (mg)in the 5000-mL aliquot titrated is 1 mg Cu solution Number ifthe total volume of the unknown solution was 250.0 mL, what is the mass of copper (mg) in the entire solution? Number mg Cu Previous Check A mi, ..POF · mi....PDF Chapter 10 in class .docx FS

Explanation / Answer

The end point volume for this titration is = 7.0 ml EDTA

The mass of copper in 50 ml solution = 0.046 M x 50 ml x 63.546 g/mol = 146.156 mg

If the total volume of unknown solution was250 ml, mass of copper in entire mixture would be = 0.046 M x 250 ml x 63.546 g/mol = 730.78 mg

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