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?
Both limestone and marble are forms of calcium carbonate.... And the bubbling indicates the evolution a gas, but which one?
And calcium carbonate, pretty insoluble stuff, undergoes a reaction with strong acids:
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.
Surely you have done practicals to examine these reactions?