Class 6 Exam > Class 6 Questions > If we blow through lime water it turns milky....
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If we blow through lime water it turns milky. This proves that _________
- a)lime water has milk in it
- b)lime water has oxygen in it
- c)Exhaled air contains carbon dioxide
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
If we blow through lime water it turns milky. This proves that _______...
Lime water becomes milky because carbon dioxide reacts with CaO and forms precipitate of CaCO3 which is white in colour.
This question is part of UPSC exam. View all Class 6 courses
Most Upvoted Answer
If we blow through lime water it turns milky. This proves that _______...
Explanation:
When we blow through lime water, it turns milky. This is because exhaled air contains carbon dioxide, which reacts with the lime water to produce a white precipitate called calcium carbonate.
Reason for the milkiness:
Lime water is a solution of calcium hydroxide (Ca(OH)2) in water. When carbon dioxide (CO2) is passed through lime water, it reacts with the calcium hydroxide to form calcium carbonate (CaCO3), which is insoluble in water. This reaction can be represented by the following equation:
Ca(OH)2 + CO2 → CaCO3 + H2O
The calcium carbonate formed is a white precipitate, which gives the lime water a milky appearance.
Presence of carbon dioxide in exhaled air:
When we breathe in oxygen, our bodies use it to produce energy through a process called cellular respiration. As a result of this process, carbon dioxide is produced as a waste product. When we exhale, we release this carbon dioxide into the surrounding air.
Therefore, when we blow through lime water, the exhaled air contains carbon dioxide, which reacts with the calcium hydroxide in the lime water to form calcium carbonate. This reaction causes the lime water to turn milky.
Conclusion:
The milky appearance of lime water when we blow through it is evidence that exhaled air contains carbon dioxide. This experiment is often used as a simple test to confirm the presence of carbon dioxide gas.
When we blow through lime water, it turns milky. This is because exhaled air contains carbon dioxide, which reacts with the lime water to produce a white precipitate called calcium carbonate.
Reason for the milkiness:
Lime water is a solution of calcium hydroxide (Ca(OH)2) in water. When carbon dioxide (CO2) is passed through lime water, it reacts with the calcium hydroxide to form calcium carbonate (CaCO3), which is insoluble in water. This reaction can be represented by the following equation:
Ca(OH)2 + CO2 → CaCO3 + H2O
The calcium carbonate formed is a white precipitate, which gives the lime water a milky appearance.
Presence of carbon dioxide in exhaled air:
When we breathe in oxygen, our bodies use it to produce energy through a process called cellular respiration. As a result of this process, carbon dioxide is produced as a waste product. When we exhale, we release this carbon dioxide into the surrounding air.
Therefore, when we blow through lime water, the exhaled air contains carbon dioxide, which reacts with the calcium hydroxide in the lime water to form calcium carbonate. This reaction causes the lime water to turn milky.
Conclusion:
The milky appearance of lime water when we blow through it is evidence that exhaled air contains carbon dioxide. This experiment is often used as a simple test to confirm the presence of carbon dioxide gas.
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If we blow through lime water it turns milky. This proves that _________a)lime water has milk in itb)lime water has oxygen in itc)Exhaled air contains carbon dioxided)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
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