%copper in brass

%copper in brass - Sam Christy Lab Partners: J. Googins, T....

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Sam Christy Lab Partners: J. Googins, T. Dunn T.A.: He Li 12/04/07 Determination of Copper in Brass Introduction: Brass is a metal alloy, and is usually composed of zinc and copper. The quantity of copper within the brass can be determined by using a UV-Vis Spectrometer. By using known solutions of copper concentrations, spectra can be obtained. A Beers Law Plot can then be used to calculate the percentage of copper within the brass sample. Procedure: Take 70mL of copper (II) solution and pour it into an Erlenmeyer flask. Using a pipet, take 5 mL of the copper (II) solution and place it into a 250 mL volumetric flask. Then take 10 mL of ammonia solution and pour it into the volumetric flask. Then fill the rest of the volumetric flask with water to the scribed mark on the neck of the flask. Mix the solution. Repeat these steps with 10, 20, and 25 mL of the copper (II) solution. Next take 0.1g of brass wire and place it in a 25 mL Erlenmeyer flask. Add 20 drops of concentrated nitric acid. Dissolve the brass wire completely; add more nitric acid if needed.
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%copper in brass - Sam Christy Lab Partners: J. Googins, T....

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