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Blowing Air into Lime Water Video Lecture | Science Olympiad Class 7
FAQs on Blowing Air into Lime Water Video Lecture - Science Olympiad Class 7
| 1. What happens when air is blown into lime water? |  |
Ans.When air is blown into lime water, carbon dioxide from the air reacts with calcium hydroxide in the lime water. This reaction produces calcium carbonate, which makes the lime water turn milky or cloudy.
| 2. Why does lime water turn milky when carbon dioxide is added? | |
Ans.Lime water turns milky due to the formation of calcium carbonate when carbon dioxide reacts with calcium hydroxide. The calcium carbonate is insoluble in water, which causes the milky appearance.
| 3. How can we test for the presence of carbon dioxide using lime water? | |
Ans.We can test for carbon dioxide by blowing air into lime water. If the lime water turns milky, it indicates that carbon dioxide is present in the air. This is a simple and effective test for detecting carbon dioxide.
| 4. What is the chemical equation for the reaction between carbon dioxide and lime water? | |
Ans.The chemical equation for the reaction is:
Ca(OH)2 + CO2 → CaCO3 + H2O.
In this equation, calcium hydroxide reacts with carbon dioxide to form calcium carbonate and water.
| 5. Is the milky appearance of lime water permanent? | |
Ans.No, the milky appearance of lime water is not permanent. If left to stand, the calcium carbonate can settle down, and the solution can clear up over time. Additionally, if excess carbon dioxide is removed, the lime water can revert to its clear state.
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Oct 05, 2025
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