carbonate

definition: 
A salt of the anion CO32-, typically formed by reaction of carbon dioxide with bases.
sentence: 
The reaction with carbonates gives the nitrate salt, water, and carbon dioxide. In natural water systems, many common minerals are formed by anion substitution-precipitation reactions, among them carbonates, phosphates, and the sulfate-containing rocks.
difficulty: 
medium
toefl frequency: 
1
toefl classification: