Question

Turmeric is a good indicator of acids and bases. It turns red in bases whereas it is yellow in both acids and neutral solutions. When we mix turmeric to the three liquids, sodium hydroxide turns it into red so we conclude that it is a base. Hydrochloric acid and sugar solution keep turmeric in yellow colour.

Answer 1

Answer:

yellow

The active ingredient present in turmeric is curcumin as an acid-base indicator that is yellow in acidic and neutral solutions and orange or reddish-brown in basic solutions [24], [25], [26]. Extracted turmeric solution absorbed visible light at 420 nm (Fig. 3a). An orange and/or reddish-brown color was obtained.