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- pH indicator
Halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually
A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. Hence, a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model. Wikipedia
