# Confused about the nomenclature of this compound (CrO3)

So i'm a little confused about the nomenclature of this compound (CrO3). is it chromium (VI) oxide? chromic acid? and then Cr2O3 is just plain Chromium (III) oxide right?

## Answers and Replies

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AGNuke
Gold Member
Yes, that's it!

chemisttree
Homework Helper
Gold Member
The oxygens in CrO3 and Cr2O3 each have a formal charge of -2.

Neither of these is chromic acid.

AGNuke
Gold Member
CrO3 is Chromium (VI) Oxide or Chromic Anhydride, as if we add water in it, it forms Chromic Acid, which is H2CrO4

chemisttree
Homework Helper
Gold Member
CrO3 is Chromium (VI) Oxide or Chromic Anhydride, as if we add water in it, it forms Chromic Acid, which is H2CrO4
The equilibrium of aqueous chromium trioxide lies far to the reactants side. Are you saying that aqueous chromic acid contains significant OH-?

AGNuke
Gold Member
I don't get what you meant. I consulted my teacher and he said that CrO3 is an acidic oxide, thus it can also be referred to as acidic anhydride.

He also mentioned that H2CrO4 is a strong acid, can be considered as an analogue to Sulphuric acid. I can't get what you meant from equilibrium.

See This : Chromium Trioxide

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