Question

Which of the following is an acid-base indicator?

• A. Vinegar
• B. Lime water
• C. Turmeric
• D. Baking soda

Answer 1

The correct option is C

Turmeric

C. Turmeric

Acid-base indicator:

• Acid-base indicators are also known as pH indicators.
• They are substances that change their color with pH.
• They are usually weak acid/base when dissolved in water and dissociate partially into ions.
• There are some natural indicators such as turmeric, red cabbage as well as China rose.
• When turmeric is added to a basic solution, it turns the yellow color into deep red color while it remains yellow in acidic solutions.

Explanation for incorrect options:

Since turmeric is a natural acid-base indicator. Thus options A, B, and D stand incorrect.

Hence, the correct option is C i.e. Turmeric.