Does SO2 also make Ca(OH)2 milk white in colour, like CO2?
To be honest about it I've never seen this done but I think the answer is yes. CaSO3 and CaCO3 in a fine suspension probably look alike. BTW, if I see it I usually don't answer questions posted using different screen names but I'll take a look at your other post by Thomas anyway.
Thank you!
And my brother uses the screen name Thomas and we access the site through the same device.
To determine whether SO2 (sulfur dioxide) also makes Ca(OH)2 (calcium hydroxide) milk white in color, we need to understand the reaction between these two substances.
When carbon dioxide (CO2) reacts with calcium hydroxide (Ca(OH)2), a white precipitate of calcium carbonate (CaCO3) is formed, which gives the milk-like appearance.
CO2 + Ca(OH)2 -> CaCO3 + H2O
On the other hand, sulfur dioxide does not react with calcium hydroxide to produce a visible white precipitate. Instead, the reaction between sulfur dioxide and calcium hydroxide forms a colorless compound known as calcium sulfite (CaSO3).
SO2 + Ca(OH)2 -> CaSO3 + H2O
Since calcium sulfite is a colorless compound, it does not cause the milk-like appearance. Therefore, unlike CO2, SO2 does not make Ca(OH)2 milk white in color.