1. 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 beet root over the message.)
Answer:
The experiment is described below:
Aim: To write a secret message with the help of baking soda and beet root and make conclusions based on what you observe.
Materials Required: Baking soda, beetroot, water, white paper.
Procedure:
(i) Prepare a baking soda solution by dissolving baking soda in water.
(ii) Dip a cotton bud in the baking soda solution and write a message of your choice on a sheet of white paper.
(iii) Rub a fresh beet root over the message.
Observation:
The message will appear in yellow on a sheet of paper.
Conclusion:
The beetroot is actually an indicator which changed colour to yellow on contact with the basic baking soda solution.
“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 beet root over the message.)” – Solved.
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Solution to Extended Learning Question 3
Solution to Extended Learning Question 4
Solution to Activity 4.1
Solution to Activity 4.2
Solution to Activity 4.3
Solution to Activity 4.4
Solution to Chapter 4 Acids, Bases and Salts
