* Chalk is primarily calcium carbonate (CaCO3).
* Calcium carbonate reacts with water and carbon dioxide to form calcium bicarbonate (Ca(HCO3)2):
CaCO3 + H2O + CO2 -> Ca(HCO3)2
* This reaction is slow and reversible. The calcium bicarbonate can break back down into calcium carbonate, water, and carbon dioxide.
* The reaction is more pronounced in acidic water. This is because the acidic water provides more hydrogen ions (H+), which help to break down the calcium carbonate.
What you'll see:
When chalk dust is added to water, you'll likely see:
* Cloudiness: The chalk dust will initially make the water cloudy.
* Some dissolving: A small amount of the calcium carbonate will dissolve, but most will remain as a suspension.
* Over time, the water may become slightly more acidic as the reaction produces a tiny amount of carbonic acid.
In summary: Chalk dust reacts with water, but the reaction is slow and not very noticeable. You won't see any dramatic changes like bubbling or color change.
