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प्रश्न
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
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उत्तर
- We know that basic and neutral solutions do not change the colour of blue litmus paper. Since blue litmus remains blue after dipping in the solution, the solution is either basic or neutral in nature.
- Put a drop of this solution on a red litmus paper. If it turns blue, the above solution is basic in nature. If no colour change occurs, it is neutral.
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संबंधित प्रश्न
Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?
Indicator is a substance which shows different colours in acidic and basic solutions.
The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?
Two solutions A and B have pH values of 3.0 and 9.5 respectively. Which of these will turn litmus solution from blue to red and which will turn phenolphthalein from colourless to pink?
Under what soil conditions do you think a farmer would treat the soil of his fields with quicklime (calcium oxide), or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?
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
Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar?
Hibiscus flower is an example for natural indicator.
Acids and bases can be identified in the laboratory by ______.
Assertion: Methyl orange and phenolphthalein are natural indicators.
Reason: Methyl orange is yellow in colour while phenolphthalein is pink.
