Question #ea16b

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Question #ea16b

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Answer 1 · 2017-03-10T18:13:11

Carbonates like limestone and marble.

Explanation:

Limestone is made of Calcium Carbonate $C a C O_{3}$ $CaCO_3$
Marble is the metamorphic form of limestone being harder but having the same chemical formula $C a C O_{3}$ $CaCO_3$

When acid is added to a carbonate the compound breaks down into Carbon Dioxide $C O_{2}$ $CO_2$ and water $H_{2} O$ $H_2O$ leaving a residue of Calcium Chloride $C a C l_{2}$ $CaCl_2$

$2 H C l = = = C a C l_{2} + H_{2} O + C O_{2}$ $2 HCl === CaCl_2 + H_2O + CO_2$

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.

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