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18 Nov 2019
8. 30pts. Cu?" in ore can be determined by complexation with ethylenediamine to form the blue- colored (Cu-eng) complex. A stock solution was prepared by dissolving 120 mg of cupric nitrate trihydrate (MW-241.60 g/mol) in 500 ml of water containing 1 ml of concentrated nitric acid. A standard copper solution was prepared by adding an excess of ethylenediamine solid powder to a 500-mL volumetric flask then adding 250.00 ml of the stock Cu solution and diluting to the mark with water. The absorbance of this solution was measured at 540 nm in a 1-cm cuvette and found to be A- 0.0625. In a separate experiment, 2-g sample of ore was dissolved in 50 mL of concentrated nitric acid. A 2.5- mL aliquot was then transferred to a 100-mL volumetric flask, an excess of ethylenediamine solid powder added, then diluted to the mark. A sample of this solution was placed in a 1-cm cuvette and an absorbance of 0.2500 was measured at 540 nm. a) Calculate the molar absorptivity of the (Cu-en complex. b) Calculate the weight percent Cu in the ore sample. The atomic weight of copper is 63.55 g/mol. looomo 241109 500 m ã´ O. DU25
8. 30pts. Cu?" in ore can be determined by complexation with ethylenediamine to form the blue- colored (Cu-eng) complex. A stock solution was prepared by dissolving 120 mg of cupric nitrate trihydrate (MW-241.60 g/mol) in 500 ml of water containing 1 ml of concentrated nitric acid. A standard copper solution was prepared by adding an excess of ethylenediamine solid powder to a 500-mL volumetric flask then adding 250.00 ml of the stock Cu solution and diluting to the mark with water. The absorbance of this solution was measured at 540 nm in a 1-cm cuvette and found to be A- 0.0625. In a separate experiment, 2-g sample of ore was dissolved in 50 mL of concentrated nitric acid. A 2.5- mL aliquot was then transferred to a 100-mL volumetric flask, an excess of ethylenediamine solid powder added, then diluted to the mark. A sample of this solution was placed in a 1-cm cuvette and an absorbance of 0.2500 was measured at 540 nm. a) Calculate the molar absorptivity of the (Cu-en complex. b) Calculate the weight percent Cu in the ore sample. The atomic weight of copper is 63.55 g/mol. looomo 241109 500 m ã´ O. DU25
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Collen VonLv2
22 May 2019
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