When dilute hydrochloric acid is placed on fock limestone and the non-sedimentary rock marble, a bubbling reaction occurs with both. What would this indicate?

1 Answer
Dec 22, 2017

Both limestone and marble are forms of calcium carbonate.... And the bubbling indicates the evolution a gas, but which one?

Explanation:

And calcium carbonate, pretty insoluble stuff, undergoes a reaction with strong acids:

CaCO3(s)+2HCl(aq)CaCl2(aq)+H2O(l)+CO2(g)

And of course liberation of carbon dioxide would account for the bubbling observed in the reaction.

The gases that bubbled off the reaction could be bled into a solution of lime-water, i.e. Ca(OH)2(aq)...and the carbonate would reprecipitate...

CO2(g)+Ca(OH)2(aq)CaCO3(s)+H2O(l)

Surely you have done practicals to examine these reactions?