Final answer:
Acids have a pH lower than 7, bases have a pH higher than 7. Lemon juice is an example of an acid with a low pH level.
Explanation:
Acid is a solution with a higher hydronium ion concentration than pure water and a pH lower than 7. For example, lemon juice has a pH of approximately 2, making it acidic.
Neutral solutions like distilled water have a pH of 7. Bases have a pH higher than 7, like soap with a pH of 12, placing it on the basic end of the scale.
Understanding pH levels is crucial in identifying whether a substance is acidic, basic, or neutral, as indicated by different pH values.
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