Question

Why is universal indicator not used in Titration?

Answer 1

Hint: In order to answer this problem let us first get some idea about chemical indicators. Any material that delivers visual evidence, usually in the form of a colour shift, of the presence or absence of a threshold concentration of a chemical species in a solution, such as an acid or an alkali.To determine the pH of a liquid, indicator paper is used.

Complete answer:
Let us know about Universal Indicator. A pH indicator formed of a solution of many compounds that exhibits multiple smooth colour changes across a wide range of pH values to show the acidity or alkalinity of solutions is known as a universal indicator. Despite the fact that there are multiple commercially available universal pH indicators, most of them are variations on a Yamada formula patented in\[1933\]. Chemical Abstracts has more information about this patent. In the Journal of Chemical Education, experiments with Yamada's universal indicator are also discussed.
Because their pH ranges differ, the universal indicator is not employed in titration. The actual pH of the solution becomes difficult to determine. As a result, no universal indicator is used in the titration.
Thymol blue, methyl red, bromothymol blue, thymol blue, and phenolphthalein make up "universal indicator." It has a pH range of less than\[\;3\] (red) to more than \[11\] (blue) (violet). Orange/yellow (\[pH{\text{ }}3-6\]), green (pH \[7\] or neutral), and blue are examples of intermediate colours (\[pH{\text{ }}8{\text{ }}to{\text{ }}11\]).

Note:
Chemically, distilled water is neutral, meaning it is neither acidic nor alkaline. In neutral solutions, the universal indicator turns green-yellow. Let us know more about pH paper and indicators. The pH paper is an indicator that changes colour depending on the material it is dipped in. A universal indicator, on the other hand, is a liquid/solution substance that is dropped into a sample and changes the substance according to the pH level (acidic or basic)