CLEANING OF A METAL
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Millet-Rivera, Concepcion C.Shurz H.S.
1. Students will determine what cleans this particular metal.
2. Understand why the solution clean the metal?
Equipment and Materials
hydrochloric acid or muriatic acid
litmus paper (red and blue)
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.