Question

Using the knowledge of acids and bases, write a secret message with the help of baking soda and beet root. Explain how it works.

(Hint: Prepare baking soda solution in water. Use this solution to write the message on a sheet of white paper with a cotton bud. Rub a slice of fresh beetroot over the message.)

Answer 1

To write a secret message using baking soda and beetroot:

1. Prepare the solution: Dissolve baking soda in water to make a solution.
2. Write the message: Use a cotton bud dipped in the baking soda solution to write a message on a sheet of white paper. Let it dry completely.
3. Reveal the message: Rub a slice of fresh beetroot over the dried message.

Explanation:

Baking soda is a base, and beetroot contains a natural pH indicator. When the beetroot juice comes into contact with the baking soda, it changes colour, revealing the hidden message.