Wipe off any fingerprints on the cuvette with a

This preview shows page 2 - 4 out of 4 pages.

water, and set the wavelength to 680 nm.Wipe off any fingerprints on the cuvette with a tissue before placing it into the spectrometer. Rinse the cuvette with distilled water, and fill a cuvette with the product of the earlier reaction, and place the cuvette in the spectrometer. Do the same for another 5 mL samples of CuNO 3 (0.02M, 0.04M, 0.06M, 0.08M) and record their absorbency. Weigh the mass of penny.React concentrated 16 M HNO 3 (nitric acid) with the penny (brass).Wait until the penny dissolves completely. CAUTION: Nitric acid is a very hazardous solution.In addition, start the reaction under a fume hood. Add distilled water to bring the volume of the solution to 100 mL. Using a pipet,fill the cuvette with the solution. Place the cuvette into the spectrometer to find the max absorbance.Construct a graph of concentration vs. absorbance. Data: 1997 penny used Mass of penny = 2.57 g Molarity of CuNo 3 Absorption at 680 1 M 0.680 0.1 M 0.546 0.08 M 0.407 0.06 M 0.335 0.04 M 0.207 0.02 M 0.098
Penny solution 0.073 Results: Graph: Equation : y= 5.48x-0.0102 Analysis: Alloy is a metal made by combining two or more metallic elements, especially to give greater strength or resistance to corrosion.

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture