What happens when you mix lime water with oxygen?

Well, darling, when you mix lime water with oxygen, a chemical reaction occurs where the lime water turns milky due to the formation of calcium hydroxide. This reaction is a classic test for the presence of carbon dioxide, as the carbon dioxide in the air reacts with the calcium hydroxide to form calcium carbonate, which is insoluble and gives the milky appearance. So, there you have it, a little science magic for your day!