What Are Indicators & How Do We Use Them? | Chemical Tests | Chemistry | FuseSchool

Introduction to pH Indicators00:00:02

pH indicators are substances that change color based on the pH of the solution, offering a qualitative way to measure pH without a pH meter.

Universal Indicator00:00:33

Universal indicator is a mixture of various indicators capable of measuring pH across the entire scale (0-14). It displays a rainbow of colors: deep red for strong acids (pH 1-2), green for neutral solutions (pH 7), and dark blue or purple for strong alkaline solutions.

Litmus Paper00:01:32

Litmus is an indicator commonly used as litmus paper. Blue litmus paper turns red in acidic conditions (pH < 7), while red litmus paper turns blue in alkaline conditions (pH > 7).

Phenolphthalein00:01:56

Phenolphthalein is used to determine the endpoint in titrations involving strong acids/strong alkalis or weak acids/strong alkalis. It changes from colorless to fuchsia pink at a pH of 8.2.

Methyl Orange00:02:13

Methyl orange is used for strong acid/strong alkali or strong acid/weak alkali titrations. It is red at a pH below 3.1 and yellow at a pH above 4.4.

Conclusion: What are Indicators?00:02:31

Indicators are substances that change color at a specific pH, known as their endpoint. Common indicators include universal indicator, litmus, phenolphthalein, and methyl orange.