Question

Makes lime water milky when carbon dioxide is passed through it

Answer 1

Lime water turns milky when you pass carbon dioxide through it because a reaction that produces a white precipitate takes place.

When you pass carbon dioxide through this solution, the two compounds carbon dioxide (CO2) and calcium hydroxide (CaOH2) will react to form white and insoluble calcium carbonate which precipitates out of the solution. The reaction is as follows:

Ca(OH)2(aq) + CO2(g) →CaCO3(s)↓+H2O