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A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model. Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. The pH value of a neutral solution is 7.0.
1 An acid-base indicator (e.g., phenolphthalein) changes color depending on the pH. 2  Redox indicators are also used. 3  A drop of indicator solution is added to the titration at the beginning; the endpoint has been reached when the color changes. Indicator: A substance that changes color in response to a chemical change. 2  An acid-base indicator (e.g., phenolphthalein) changes color depending on the pH. 3  Redox indicators are also used. 4  A drop of indicator solution is added to the titration at the beginning; the endpoint has been reached when the color changes.