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The concentration of hydrogen ions is called the pH scale. Low pH corresponds to high hydrogen ion concentration and vice versa. An acid is a substance that when added to water increases the concentration of hydrogen ions (lowers the pH). A substance that reduces the concentration of hydrogen ions (raises the pH) is called a base.
The pH scale measures from pH 1 to pH 14. If a substance has a pH of 1-5, it is an acid. If a substance has a pH of 6-7, it is neutral. And finally, if a substance has a pH of 8-14, it is a base. A pH of 1-3 or 12-14 is considered to be a strong acid or base.