Investigation 21: How Much Copper is in One Coin? -...

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Precalculus: A Concise Course
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Chapter 1 / Exercise 7
Precalculus: A Concise Course
Larson
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CHE125-J January 28, 2019 Investigation 21 Lab Proposal Investigation 21: How Much Copper is in One Coin? Introduction: Throughout several decades the composition of copper and zinc in a penny has changed over time. In this investigation our group will be identifying the composition of copper and zinc in a coin before 1983 and after 1983. Goals: 1. Determine the amount of copper and zinc in one-cent coins made before 1983 and after 1984 2. Compare the cost of coins made with copper to coins made with zinc based on the raw materials used inside each coin 3. Develop a method of waste disposal for the copper (II) ion solution 4. Report findings to instructor as observed in lab Materials: Pennies of various ages 6 M HNO 3 (aq) 6 M HCL (aq) 6 M NaOH (aq) Cu(NO 3 ) x 3H 2 O (solid) 1.0 M Zn(NO 3 ) 2 Solid Copper Solid Zinc Balances Device for measuring light absorbance Cuvettes
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Precalculus: A Concise Course
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Chapter 1 / Exercise 7
Precalculus: A Concise Course
Larson
Expert Verified
Tissues Volume measuring equipment
Detailed Procedures: 1. Gather all necessary materials 2.

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