Question

What are some examples of sedimentary rocks that react with acid?

Answer 1

Carbonates, such as limestone

Explanation:

Limestone is made of Calcium Carbonate. `Ca (CO_3)`It is most likely that the limestone is formed from dissolved sea shells and coral reefs. The organic materials that form the hard outer shell of shell fish and corals is Calcium Carbonate.

When Calcium Carbonate reacts with acid the Carbon Dioxide that was used to produce the Carbonate is released. The equation is

`Ca(CO_3) + 2 H^+ X^-= CaX_2 + H_2O + CO_2`

The X can be any negative ion such as Chlorine -1 `Cl^-1`

The Carbonate always undergoes a decomposition reaction with an acid resulting in water and Carbon Dioxide