Deck 12 - Pack Questions

Question 1

When carbon dioxide is bubbled through lime water the initially clear solution becomes cloudy why?

Answer 1

CO2(g)+ Ca(OH)2(aq)––> CaCO3(s) + H2O(l)- the carbon dioxide reacts with the lime water to produce calcium carbonate which is insoluble.

Question 2

If excess carbon dioxide is bubbled through limewater, the calcium carbonate suspension disappears and is replaced by a clear solution, why?

Answer 2

CO2(g)+ H2O(l)+ CaCO3(s)––> Ca(HCO3)2(aq)- Calcium hydrogen carbonate is produced and is clear in aqueous solution.

Question 3

How can you reverse the reaction that forms calcium hydrogen carbonate solution?

Answer 3

Ca(HCO3)2(aq)––> H2O(l) + CaCO3(s)+ CO2(g)- if calcium hydrogen carbonate is heated, carbon dioxide gas is given off, and the suspension of calcium carbonate returns.