pH indicator

A pH indicator is a substance that changes color depending on the acidity or alkalinity of a solution. It helps determine whether a liquid is more acidic (like lemon juice), neutral (like pure water), or alkaline (like baking soda solution). When added to a solution, the indicator reacts with the hydrogen ions present, causing a visible color change that corresponds to specific pH levels. This makes pH indicators valuable tools in laboratories, health, and environmental testing for quickly assessing the chemical nature of a substance without complex equipment.