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Do Indicators Change Color?

Maya Lin-Takahashi • • 6 min read
Do Indicators Change Color?

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

conjugate base
For an aqueous solution of a weak acid, the dissociation constant is called the acid ionization constant (Ka). Similarly, the equilibrium constant for the reaction of a weak base with water is the base ionization constant (Kb). For any conjugate acid–base pair, KaKb=Kw.
or acid forms have different colors due to differences in their absorption spectra.

What is it called when the indicator changes color?

The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of reactants have been mixed. ... The endpoint (related to, but not the same as the equivalence point) refers to the point at which the indicator changes color in a colorimetric titration.

Do indicators change color at pKa?

pKa of indicators

The consequence of this answer is that the indicator will change colour when the pH is the same value as its pKa value.

Maya Lin-Takahashi
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Maya Lin-Takahashi

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.