Question #ea16b

1 Answer
Mar 10, 2017

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.