Millet-Rivera, Concepcion C.Shurz H.S.

Objectives 1. Students will determine what cleans this particular metal. 2. Understand why the solution clean the metal? Equipment and Materials plastic cups pennies water vinegar ammonia hydrochloric acid or muriatic acid litmus paper (red and blue) Recommended Strategies Form groups of students. Give each group 4 cups, in each cup pour in a small amount of each solution (soln.#1- vinegar; soln. #2- ammonia; soln.#3- water; and soln. #4- hydrochloric acid). Give each group pennies and litmus paper. Have students decide on their own which solution is acid or base and which solution will clean the penny. Discuss why.
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