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Students will use clues to discover the pH values of a variety of objects. Clues could be handed to each group (for a quicker activity) or taped around the classroom (for more of a challenge). Students will work together to assign each item a pH value and color using the provided clues. This activity includes the clues, student response sheet, and answer key. This activity is such a fun challenge! Students have to really have an understanding of how to read the pH scale and know which pH values are more acidic than the others.
Clue Example: This substance is more acidic than orange juice but not as acidic as stomach acid. Stomach acid has a pH of 1.