Carbonic acid forms when carbon dioxide is absorbed into water. The action of carbonic acid on _______ may pr?

Question

A. clay

B. granite

C. limestone

D. sandstone

Answer 1

Some folks may believe that carbonic acid, H2CO3, actually exists in aqueous solution, but I have news for you, "it ain't so".

There are no molecules of H2CO3 in solution.  What we call "carbonic acid" is actually a solution of carbon dioxide dissolved in water in equilibrium with hydrogen ions and bicarbonate ions:

CO2(aq) + H2O <==> H+ + HCO3-

As you can see, dissolving CO2 in water will produce some hydrogen ions.  This acidic solution will react with the carbonate ion in limestone (CaCO3) to produce more CO2.

CaCO3(s) + 2H+ --> Ca2+ + CO2(g) + H2O

Answer 2

I know that carbonic acid dissolves limestone, and when the water evaporates, it precipitates the calcium carbonate as stalagmites or stalactites.

Next time, please write in the whole question.