what is an indicator
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Indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model.
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Indicators are the substances or any object that indicate the presence of something. The most common indicator is litmus paper or china rose(hibiscus). The litmus paper turns red when dipped in acidic medium and blue in basic medium.
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