Question

What will happen if a solution of baking soda is put on turmeric paper?

A. The colour of turmeric paper changes from yellow to blue.

B. The colour of turmeric paper changes from yellow to green.

C. The colour of turmeric paper changes from yellow to red.

D. The colour of turmeric paper changes from yellow to magenta.​

Answer 1

Answer:

A ans Turmeric contains curcumin, a chemical that turns red with bases and yellow with acids in water. Baking soda is a base, so when students add turmeric, the curcumin in it turns red. The carbon dioxide produced in the reaction mixes with water to make an acid. So in the course of the reaction, the solution turns yellow.

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Answer 2

Answer:

Turmeric (and curry powder, which contains turmeric) is an acid base indicator. When it reacts with bases (like baking soda), it changes color to deep red. This red form of the indicator can change back to yellow when acids are added. Thus the color of the chemical “indicates” the presence of an acid or base.