I am a bit confused about the reaction that will occur between carbonic acid and calcium carbonate. When I try to relate the reaction to an apparently similar acid base reaction I get a result that makes it appear as if no reaction would occur.
CaCO3 + H2SO4--> CaSO4 + CO2 + H2O
Now for the reaction I am interested in,
CaCO3 + H2CO3 ---> CaCO3 + H2O + CO2
The problem I am having is that it appears as though calcium carbonate would just appear again on the product side. The reason I thought of this equation in the first place is because I was thinking about ocean acidifiction and the tole it is taking on corals ( primarily sps corals) which are made up primarily of calcium carbonate. I assume that carbon dioxide is the main cause of ocean acidification and that a reaction involving carbonic acid is responsible for damaging the calcium carbonate skeletons of corals. Any quick insight on this reaction would be great. Thanks.