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प्रश्न
Prepare red cabbage juice by boiling a piece of red cabbage in water. Use it as an indicator and test the acidic and basic solutions with it. Present your observations in the form of a table.
उत्तर
Red Cabbage Juice as an Indicator:
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Prepare the Indicator:
- Boil a piece of red cabbage in water until the water turns dark purple. This cabbage juice will act as a pH indicator.
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Testing Solutions:
- Collect various acidic and basic solutions for testing (e.g., lemon juice, vinegar, baking soda solution, soap water).
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Observations:
| Solution | Colour Change with Red Cabbage Juice | Nature |
| Lemon Juice | Pink/Red | Acidic |
| Vinegar | Pink/Red | Acidic |
| Baking Soda Solution | Green/Blue | Basic |
| Soap Water | Green/Blue | Basic |
| Distilled Water | Purple (No change) | Neutral |
Explanation:
- Acidic solutions turn the red cabbage juice pink/red.
- Basic solutions turn the red cabbage juice green/blue.
- Neutral solutions show no significant colour change, remaining purple.
संबंधित प्रश्न
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
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How does a universal indicator work?
The pH values of five solutions A, B, C, D and E are given below:
| A | 1 |
| B | 5 |
| C | 7 |
| D | 11 |
| E | 13 |
Which solution isneutral neutral.
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.
What sort of reaction takes place when solution A reacts with solution B?
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Phenolphthalein is a natural indicator.
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Assertion: Methyl orange and phenolphthalein are natural indicators.
Reason: Methyl orange is yellow in colour while phenolphthalein is pink.
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