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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.
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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.
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संबंधित प्रश्न
Is the distilled water acidic/basic/neutral? How would you verify it?
- Both acids and bases change colour of all indicators.
- If an indicator gives a colour change with an acid, it does not give a change with a base.
- If an indicator changes colour with a base, it does not change colour with an acid.
- Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
What colour does the following indicator turn when added to a base or alkali (such as sodium hydroxide)?
Litmus
The indicators which turn red in acid solution are ______.
The property which is common between vinegar and curd is that they ______.
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?
Name the acids or alkalis used to make car batteries.
Separate the following into substances having pH values above and below 7. How do these influence litmus paper?
- Lemon juice
- Solution of washing soda
- Toothpaste
- Vinegar
- Stomach juices
A solution turns blue litmus red. Its pH is likely to be ______.
The salt whose aqueous solution will turn blue litmus to red is ______.
