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water, and set the wavelength to 680 nm.Wipe off any fingerprints on the cuvette with a tissuebefore placing it into the spectrometer. Rinse the cuvette with distilled water, and fill a cuvettewith the product of the earlier reaction, and place the cuvette in the spectrometer. Do the samefor another 5 mL samples of CuNO3(0.02M, 0.04M, 0.06M, 0.08M) and record theirabsorbency. Weigh the mass of penny.React concentrated 16 M HNO3(nitric acid) with thepenny (brass).Wait until the penny dissolves completely.CAUTION: Nitric acid is a veryhazardous solution.In addition, start the reaction under a fume hood. Add distilled water tobring the volume of the solution to 100 mL. Using a pipet,fill the cuvette with the solution. Placethe cuvette into the spectrometer to find the max absorbance.Construct a graph of concentrationvs. absorbance. Data:1997 penny usedMass of penny = 2.57 gMolarity of CuNo3Absorption at 6801 M0.6800.1 M0.5460.08 M0.4070.06 M0.3350.04 M0.2070.02 M0.098
Penny solution0.073Results:Graph:Equation:y= 5.48x-0.0102Analysis:Alloy is a metal made by combining two or more metallic elements, especially to givegreater strength or resistance to corrosion.