Search results
A chemical indicator is a substance that changes colour or other property to indicate the presence or absence of a chemical species, such as an acid or an alkali. Learn about different types of indicators, their applications, and examples from Britannica.com.
- The Editors of Encyclopaedia Britannica
Jan 30, 2023 · Indicators are organic weak acids or bases with complicated structures. For simplicity, we represent a general indicator by the formula HIn, and its ionization in a solution by the equilibrium, HIn ⇌ H + + In −. and define the equilibrium constant as Kai, Kai = [H +][In −] [HIn] which can be rearranged to give.
A chemical indicator is a substance that changes visibly when conditions in a solution change. Learn about different types of indicators, such as pH indicators, fluorescent indicators, and titration indicators, and how they are used in chemistry.
Sep 1, 2023 · Learn what chemical indicators are, how they change color in acidic or basic solutions, and what types and uses they have. Find out the mechanism, characteristics, and importance of acid-base indicators in chemistry.
This page titled 21.20: Indicators is shared under a CK-12 license and was authored, remixed, and/or curated by CK-12 Foundation via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request. An acid-base indicator is a substance that displays different colors when in ...
Feb 6, 2020 · Acid-base indicators are chemicals used to determine whether an aqueous solution is acidic, neutral, or alkaline. Because acidity and alkalinity relate to pH, they may also be known as pH indicators. Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice. An acid-base indicator is a weak acid or weak base ...
People also ask
What are indicators?
What is a chemical indicator?
What indicators are used in the laboratory?
What are the different types of chemical indicators?
Jun 19, 2020 · Figure [Math Processing Error] 7.21. 1: pH indicators. (CC BY-NC; CK-12) Depending on the pH at the equivalence point, the appropriate indicator must be chosen. For example, bromphenol blue has a yellow color below a pH of about 3 and a blue-violet color above a pH of about 4. Bromphenol blue would not be a good choice as the indicator for a ...
