Here's how it's used to test for a gas your body gets rid of:
* The gas: The gas your body gets rid of that limewater tests for is carbon dioxide (CO₂).
* The reaction: When carbon dioxide is bubbled through limewater, it reacts with the calcium hydroxide to form calcium carbonate (CaCO₃), which is a white, milky precipitate.
* The result: The appearance of the white precipitate indicates the presence of carbon dioxide.
So, to summarize:
* Limewater (calcium hydroxide solution) is used to test for carbon dioxide, a gas your body exhales as a waste product.
* The reaction of carbon dioxide with limewater produces a white precipitate (calcium carbonate), which confirms the presence of carbon dioxide.
