Nomenclature:
Why is Na_2 CO_3 written as sodium carbonate rather than disodium carbonate? Shouldn't the two sodiums be considered?

Question

Nomenclature:
Why is Na_2 CO_3 written as sodium carbonate rather than disodium carbonate?  Shouldn't the two sodiums be considered?

abb0t · Answer

CO$_3$$^{2-}$ is one of your polyatomic ions. But, I believe by rules, positive ion is named, then followed by the name of the negative ion.

abb0t · Answer

monatomic positive ions have the name of the element from which they are formed.

abb0t · Answer

It is just the rule, this is to avoid confusion. This rule is the same internationally. You just have to accept this rule.

anonymous · Answer

How would you write NaCO_3 ?  Would this still be named sodium carbonate?

anonymous · Answer

Ok, i think i just needed to review ionic compounds - there can't possibly be a NaCO_3.

abb0t · Answer

That would be incorrect. Carbonate is CO$_3$$^{2-}$

abb0t · Answer

You can draw the lewis dot structure to confirm this.

vincent-lyon.fr · Answer

It is because there is no ambiguity, since the carbonate ion is unique. No other compound with sodium ions can be formed.

anonymous · Answer

Thank you!