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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. Procedure: Take a test tube with freshly prepared lime water (calcium hydroxide solution). Blow air through the lime water using a straw and note the time it takes for the solution to turn milky. In another test tube with fresh lime water , use a syringe or pichkari to pass ambient air through the solution and note the time it takes to turn milky. In glass tumbler B ( lime water ), blowing air creates bubbles, and the lime water turns milky (cloudy). After some time, a white substance (calcium carbonate) settles at the bottom (page 4). When carbon dioxide (CO₂) gas comes into contact with lime water (a solution of calcium hydroxide), a chemical reaction occurs. Lime Water Turns Milky Carbon dioxide reacts with lime water to form calcium carbonate, a white solid that makes the solution look milky or cloudy. This solid eventually settles at the bottom of the container.
