Question

Question #ea16b

Answer 1

Carbonates like limestone and marble.

Explanation:

Limestone is made of Calcium Carbonate `CaCO_3`
Marble is the metamorphic form of limestone being harder but having the same chemical formula `CaCO_3`

When acid is added to a carbonate the compound breaks down into Carbon Dioxide `CO_2` and water`H_2O` leaving a residue of Calcium Chloride`CaCl_2`

`2 HCl === CaCl_2 + H_2O + CO_2`

The fizz of the carbon dioxide gas being released is a easily
recognized indicator of the presence of the carbonate. This makes the acid test a good way of identifying limestone and marble.