Home Turmeric Turmeric as indicator | Acids & Bases | Chemistry

Turmeric as indicator | Acids & Bases | Chemistry

by Author
Turmeric as indicator | Acids & Bases | Chemistry

Watch how a water based solution of turmeric, a common South Asian cooking spice, can be used as an acid-base indicator. Turmeric only changes colour in the presence of a base, and not in the presence of an acid. An indicator is a substance that changes its colour depending on the pH value of a liquid. Bases such as a soap solution have a pH value greater than 7, whereas acidic liquids like lemon juice have a pH value less than 7. The normally yellow turmeric changes to red-orange when dropped into soap solution, indicating that the soap solution is basic. When acidic lemon juice is slowly added to this, the red-orange gradually weakens and the original yellow is seen again, showing that the acidic lemon juice reacted with the basic soap solution, and turned the liquid to neutral

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

Privacy & Cookies Policy
error: Content is protected !!