1. What are indicators?
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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. Hence, a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model
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Indicators are substances whose solutions change color due to changes in pH. ... They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra.
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