Carbon dioxide!
When limewater goes cloudy it means carbon dioxide is present!
The gas collected from the dead animal and bubbled through lime water is likely carbon dioxide (CO2). This gas reacts with the lime water (calcium hydroxide) to form calcium carbonate, which is insoluble and appears as a cloudy white precipitate.
You can test for carbon dioxide gas using lime water. When carbon dioxide is blown into lime water, it turns cloudy due to the formation of calcium carbonate.
When carbon dioxide is passed through lime water it goes cloudy.
When carbon dioxide is passed through lime water it goes cloudy.
Lime water (calcium hydroxide) turns milky/cloudy when exposed to carbon dioxide due to the formation of calcium carbonate, which is insoluble. This property makes it a useful indicator for the presence of carbon dioxide in a substance or a gas.
You can test it with the Lime Water test. If there is carbon dioxide in your breath then the Lime Water should turn cloudy.
It turns cloudy (or milky). Lime water is calcium hydrogen carbonate dissolved in water. When it comes into contact with carbon dioxide, they react together to make calcium carbonate (chalk), which is white and less soluble in water. So the fine white precipitate that forms makes the solution turn cloudy.
The lime water is testing for the presence of carbon dioxide gas. When hydrochloric acid reacts with calcium carbonate, carbon dioxide gas is produced. This gas is then passed through the lime water, which will turn milky/cloudy if carbon dioxide is present.
Limewater is an indicator for Carbon Dioxide
The gas yielded from a chamical reaction should be allowed to pass through clean lime water. If the gas is CO2, it turns lime water milky by formation of CaCO3. This is the confirmatory test for CO2 gas
when lime water react with carbon dioxide,it turns milky.So, we have to take some lime water in a test tube and exhale 2 -3 times to the test tube through a bend tube. It will turn milky and that's why our exhaled breath is carbon dioxide.