Here's why:
* Indicator: It indicates a change in the solution's properties.
* pH: It specifically indicates the acidity or alkalinity (pH level) of the solution.
Some common examples of pH indicators are:
* Litmus paper: Turns red in acidic solutions and blue in basic solutions.
* Phenolphthalein: Colorless in acidic solutions and pink in basic solutions.
* Methyl orange: Red in acidic solutions and yellow in basic solutions.
These indicators work by undergoing a chemical change in their structure as the pH changes, leading to a visible color shift.
