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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.
Acids & bases. Vocabulary acid anthocyanin base chemical change indicator pH In theory, any substance that undergoes a reversible chemical change when pH changes can be used as an acid-base indicator. In practice, a sharp change in some easily detectable property of the substance is required.Usually, the property is color; but other properties such as odor can also change with pH. Here's a partial list of house and garden materials that can be used as acid/base indicators.n practice, a sharp change in some easily detectable property of the substance is required. Usually, the property is color; but other properties such as odor can also change with pH. Here's a partial list of house and garden materials that can be used as acid/base indicators.