What Is pH?

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Simple Definition:

pH is a measure of how acidic or basic (alkaline) a substance is. The pH scale ranges from 0 to 14, with 7 being neutral. A pH below 7 is acidic and a pH above 7 is basic. Examples of substances with different pH values include lemon juice (pH around 2), water (pH 7), and bleach (pH around 12).

Very Simple Definition:

A measure of how acidic or basic a substance is. pH values range from 0 to 14, with 7 being neutral, values below 7 are acidic, and values above 7 are basic (for example, lemon juice has a pH of about 2, while baking soda has a pH of about 9).

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