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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 When we want to decide whether a solution (in water) is acidic or basic, we can measure its pH. 2  One of the ways pH can be measured, is with an acid-base indicator, such as universal indicator. 3  An acid-base indicator is a substance that changes its colour depending on the pH of the solution that it is added to.e know that some substances change colour when they react with an acid or a base. These substances are called acid-base indicators, which can show us if a substance is an acid or a base. Different indicators change colour at different pH values.