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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.
15 Ιουλ 2019 · A chemical indicator is a substance that undergoes a distinct observable change when conditions in its solution change. This could be a color change, precipitate formation, bubble formation, temperature change, or other measurable quality.
28 Ιουν 2023 · In chemistry, chemical indicators are substances that undergo a distinct observable change when exposed to certain conditions, often related to the presence of acids or bases. The most common change is a color shift, but olfactory indicators, which respond by altering scent, are also used.
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 \(\ce{In^-}\).
Definition: Indicators are substances that change color in response to a change in pH. Purpose: Used to determine the endpoint of a titration and to gauge the pH of a solution.
12 Ιουλ 2023 · In more basic solutions where the hydronium ion concentration is less than 5.0 × 10 −9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are called acid-base indicators. Acid-base indicators are either weak organic acids or weak organic bases.
