In this experiment, you will be carrying out a qualitative chemical analysis of old pennies and of new pennies (these groups are as determined in the previous lab about pennies). "Qualitative" means that you will be making careful observations, but not making any numerical measurements.
|super-shears||concentrated nitric acid|
|bunsen burner||concentrated hydrochloric acid|
|iron wool (for scrubbing)||concentrated sulfuric acid|
|sodium sulfide solution||ammonia solution|
Procedure - Qualitative Analysis of a Penny
See how each sample material and the old and new penny react to each of the test liquids. Use the minimum amount of each material possible for each test. To see if a metal is soluble in a liquid, place the metal sample in a small clean test-tube, then add a few drops of the liquid in question. Record any observations. After a few minutes, dispose of the liquid in the waste jar, and rinse the test tube thoroughly. If the metal is not damaged, save it for the next test. Examine the metal for pitting or etching, and record your observations.
Besides the three pennies issued, further tests are at your own expense! Use your common sense (ha ha).
All acid waste should be disposed of according to your teacher's instructions. Thoroughly clean your lab bench with a sponge dipped in soapy water at the front sink.
Construct an observation table to present your results. You should be able to compare every metal and both pennies for each test. Write a paragraph telling which of the metals tested best matched the reactions of the old pennies, and of the new pennies. Do these results agree with your previous lab? You may wish to refer to your previous penny lab.
Student Learning Expectations
A2 - A Middletown High School graduate will acquire, analyze, and evaluate information and ideas to effectively solve problems.
S1 - A Middletown High School graduate will demonstrate responsibility for his or her own actions, behaviors, and academic success.
S2 - A Middletown High School graduate will work cooperatively to achieve group goals and resolve issues.
[Analysis of Pennies score sheet][General Lab Rubric][MHS Chem page]