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A pH scale measures if a substance is a base or a acid which is indicated by the amount of Hydrogen ions in a solution.

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The pH scale is a measurement system that indicates the concentration of HYDROGEN IONS in a solution.

The pH scale ranges from zero to 14. A pH that is less than 7 is considered to be acidic while a pH that is more than 7 is considered to be basic. pH 7 is considered to be neutral. The pH of a substance is dependent on the number of hydrogen ions that are present in the substance.