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प्रश्न
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.)
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उत्तर
To write a secret message using baking soda and beetroot:
- Prepare the solution: Dissolve baking soda in water to make a solution.
- 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.
- 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.
संबंधित प्रश्न
Fill in the blank in the following sentences:
Acids have a ..........................taste and they turn..........................litmus to..........................
hich is more basic (or more alkaline) : a solution of pH = 8 or a solution of pH = 11?
Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?
Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?
What do you think will be the pH in the stomach of a person suffering from indigestion: less than 7 or more than 7?
Separate the following into substances having pH values above and below 7. How do these influence litmus paper?
(i) Lemon juice
(ii) Solution of washing soda
(iii) Toothpaste
(iv) Vinegar
(v) Stomach juices
Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar?
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.
What will be the action of solution A on litmus?
The salt whose aqueous solution will turn blue litmus to red is:
(a) ammonium sulphate
(b) sodium acetate
(c) sodium chloride
(d) potassium carbonate
Hibiscus flower is an example for natural indicator.
