Draw a horizontal linear scale from 0 to 14 using each increasing number (2, 3, 4, etc.) as a point on the scale. Label the diagram for pH. Perform research (library, Internet, etc.) on common household substances to determine their pH levels. List the verified items (at least 20) by their scale number.
NOTE: Many commercial substances (e.g., shampoo) list pH levels on the label.
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