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Study with Quizlet and memorize flashcards containing terms like What is an indicator, What are two commonly used indicators, What us the pH of a substance usually between and more.
An indicator is a weak acid that ionizes within a known pH range, usually about 2 pH units. We can represent the protonated form of the indicator molecule as \(\ce{HIn}\) and the deprotonated form as \(\ce{In^-}\).
30 Ιαν 2023 · Indicators are substances whose solutions change color due to changes in pH. These are called acid-base indicators. 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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Chemical indicator, any substance that gives a visible sign, usually by a color change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. The indicator changes color when it reaches a critical range of values.
