Discussion
When an acid reacts with a metal carbonate, the products formed are _____________
Answer: D
An acid reacting with a metal carbonate gives a salt, water and carbon dioxide:
\[ \mathrm{Na_2CO_3 + 2HCl \rightarrow 2NaCl + H_2O + CO_2} \]
The effervescence of carbon dioxide is the standard laboratory test for a carbonate; the gas turns limewater milky.
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