A question about CO3?

Instead of calling the compound carbon trioxide, why do we call it carbonate, is it because it has a negative charge?

Answer:
1. CO3 is not a compound; it is an ion

2. It does not have a free existence. It lives in combination with metals. eg. sodium carbonate (baking soda), calcium carbonate (marble), etc

3. It is a part of the salt formed by the combination carbonic acid with a base, such as sodium hydroxide or calcium hydroxide.

4. If CO3 were a compound, your name could be technically used. But such a compound is impossible according to chemical logic or theory.
Yes, the ion has a negative charge, and charged compounds are identified by their ionic names.
It is an old traditional name that has been around about as long as chemistry.
Well think about the lewis structure of CO3. Carbonate is a polyatomic ion with a central carbon atom surrounded by three oxygen atoms. The carbonate ion that has a -2 formal charge. The reason for the charge is the incomplete valence of two of the oxygens. If you consider the octet rule there are four bonds to carbon, two of the oxygens have single bonds and one of them has a double bond. The doubly bonded oxygen has a full valence whereas the other two oxygens do not.

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