Students will design a laboratory procedure to analyze the amount of copper in brass using a spectrophotometer. Students identify the correlation among wavelength, absorbance, and concentration for each of three possible ions that may be obtained from brass: copper, zinc, and iron. The activity contains enough materials for 15 groups of students as well as a Teacher’s Guide and Student Study Guide Copymasters. This lab meets Big Idea 1, Investigation 2, and Primary Learning Objective 1.16. Kit Includes: 50mL Cupric Nitrate 0.1M 50mL Cupric Sulfate 0.1M 50mL Ferric(III) Nitrate 0.1M 50mL Ferric Sulfate 0.1M 50mL Zinc Nitrate 0.1M 50mL Zinc Sulfate 0.1M 100mL Cupric Nitrate 0.4M 100mL Nitric Acid 70% 20g Brass Pellets Materials needed but not supplied: Beakers, 50mL Graduated Cylinders, 50mL Pipets Pipet Bulbs Volumetric Flask, 100ml Test Tube Racks Watch Glasses Test Tubes Wash Bottle 96-well Reaction Plates Distilled Water Spectrophotometer w/ Cuvettes Electronic Balance DOT Info: UN2031, Nitric acid, 8(5.1), II WARNING: This product can expose you to chemicals including Strong inorganic acid mists containing sulfuric acid, which are known to the State of California to cause cancer. For more information go to http://www.P65Warnings.ca.gov.