When carbondioxide is bubbled into limewater a white precipitate is formed. If the passage of the gas is continued, the precipitate disappears. The reason for this is
- calcium carbonate is formed which on reaction dissolves
- calcium hydrogen carbonate is precipitated and then dissolves
-
calcium carbonate is formed which on reaction with further carbondioxide forms solube calcium hydrogen carbonate
- concentration of the solution has occurred with the deposition of calcium hydroxide
- the solution has become saturated and solid carbondioxide has been deposited