How does turmeric act as an Acid-Base Indicator?



  • Indicators help us to identify if a substance is an acid or base .
  • Turmeric is yellow in colour naturally .
  • It changes colour when in a basic substance to red.
  • So turmeric in ,
    • Acid Yellow
    • Neutral Yellow
    • Base Red
  • This way turmeric can be used as an indicator.
  • Example, 
    • In Hydrochloric Acid (HCl), turmeric remains yellow
    • In Sodium Hydroxide (NaOH), turmeric turns red


  1. Class 10
  2. Chapter 2 Class 10 - Acids, Bases and Salts (Term 1)

About the Author

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo