Question

Acid - What are the alkali indicators? According to Quinonoid theories, explain their methodology. ​

Answer 1

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n indicator is a substance which is used to determine the end point in a titration. In acid-base titrations, organic substances (weak acids or weak bases) are generally used as indicators.

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Answer 2

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The alkali indicator is the substance, which differ in color in the acidic and alkaline solution. In other words, acid-alkali indicator is weak acid or weak alkaline. The hydrogen ion $\bf \: [H {}^{ + } ]$concentration or hydroxide io n $\bf\:[OH]^{-}$concentration, i.e. pH values, in these solutions, changed their color information to their color. Converts them.

According to the quinoneoid theory, acids - alkalis signifiers are present in two transient forms, which differ in structures. Both transient forms reside in equilibrium with each other. The color of both forms of the indicators is colorless or light colored and darker, respectively.

The appearance of a light colored bengineoid structure and dark complexion Quinonoid structure is called.

In acidic and alkaline medium, one of the two forms is mainly acidic and the second is mainly present in the alkaline medium. When the pH of the medium is changed, then moving from one form to the other. Changes and changes in mood color changes.