Confused about the nomenclature of this compound (CrO3)

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Discussion Overview

The discussion revolves around the nomenclature of the compound CrO3, exploring its classification as either chromium (VI) oxide, chromic acid, or chromic anhydride. Participants also touch upon the relationship between CrO3 and Cr2O3, as well as the properties of these compounds in aqueous solutions.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that CrO3 is chromium (VI) oxide, while others suggest it is chromic acid.
  • One participant states that CrO3 and Cr2O3 have oxygens with a formal charge of -2, asserting that neither is chromic acid.
  • Another participant claims that CrO3 is chromium (VI) oxide or chromic anhydride, noting that it forms chromic acid (H2CrO4) when water is added.
  • A later reply questions the assertion about the equilibrium of aqueous chromium trioxide, asking if it implies that aqueous chromic acid contains significant OH-.
  • One participant mentions consulting a teacher who described CrO3 as an acidic oxide and an acidic anhydride, and referred to H2CrO4 as a strong acid analogous to sulfuric acid.
  • There is confusion regarding the equilibrium concept and its implications for the classification of CrO3.

Areas of Agreement / Disagreement

Participants express differing views on the nomenclature and classification of CrO3, with no consensus reached on whether it should be referred to as chromic acid or chromium (VI) oxide. The discussion remains unresolved regarding the implications of equilibrium in aqueous solutions.

Contextual Notes

There are limitations in the discussion regarding the definitions of terms like "acidic oxide" and "acidic anhydride," as well as the implications of equilibrium in the context of chromic acid.

chemist2b
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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?
 
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Yes, that's it!
 
The oxygens in CrO3 and Cr2O3 each have a formal charge of -2.

Neither of these is chromic acid.
 
CrO3 is Chromium (VI) Oxide or Chromic Anhydride, as if we add water in it, it forms Chromic Acid, which is H2CrO4
 
AGNuke said:
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-?
 
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
 
Last edited:

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