Indicators
What is Indicators?
Chemical indicators are substances that change color in response to changes in the chemical environment, most commonly pH, making them useful for detecting the equivalence point in acid-base titrations. Common examples include phenolphthalein (colorless in acid, pink in base) and litmus (red in acid, blue in base). The color change of an indicator occurs over a specific pH range corresponding to the pKa of its weak acid or base form.
Key Facts
Frequently Asked Questions
Chemical indicators are substances that change color in response to changes in the chemical environment, most commonly pH, making them useful for detecting the equivalence point in acid-base titrations. Common examples include phenolphthalein (colorless in acid, pink in base) and litmus (red in acid, blue in base). The color change of an indicator occurs over a specific pH range corresponding to the pKa of its weak acid or base form.