Talk:Chromium(III) oxide

Clarification needed

The article should clarify the relations between CrO3, Cr2O3, chromic oxide, chromium trioxide, and chromium (III) oxide anhydride. Rl 16:36, 21 August 2005 (UTC)

• So it should! For a start, it shouldn't be called Chromia, a name for which I can't find any evidence of it's use... Physchim62 20:55, 21 August 2005 (UTC)

• Chromia seems to refer to chromic oxide, as alumina refers to aluminum oxide or silica to silicon dioxide. Apparently depends on the scientific community. – Thanks for working on this! Rl 21:36, 21 August 2005 (UTC)

• Sorry for the sloppy start, and thanks for cleaning it up. I’ll be more careful next time when starting an article on a chemical compound. DV8 2XL

Use?

There isn't anything in this article about it's use, wouldn't that be an important addition to start with? --weh? i need an nswer. tsk.Sfxsigma 06:31, 5 October 2007 (UTC)

I think that Cr2O3 is what stains motorcycle exhaust headers. Preventing it's formation on chrome plating at high temperature or removing it while retaining a shiny chrome plate surface would be a useful thing. —Preceding unsigned comment added by 18.51.3.207 (talk) 23:47, 23 April 2010 (UTC)

Infobox Color?

Since this is the only article for Chrome Green as a pigment, where is the Infobox Color that would say what color it is? And where does such information come from? Some of the other instances of Infobox Color do not reference the data. Is there a way of determining which articles have a particular Infobox (wikipedia search does not find them)? —Preceding unsigned comment added by 173.73.179.150 (talk) 07:02, 27 October 2010 (UTC)

Is there an inorganic chemist in the house?

Both this and the CrCl3 article contain(ed) some questionable uncited statements. It is not my line, and I am busy, but if no one else wants to tackle it, I can supplement the text with cited material.JonRichfield (talk) 14:56, 2 May 2017 (UTC)

Soluble in acid/base or not?

Multiple places in the article are contradictory about this:
The info box and "Structure and properties" say it's not soluble in acids,
Yet "Reactions" says plainly "Although insoluble in water, it dissolves in acid to produce hydrated chromium ions, [Cr(H2O)6]3+"

Also, the following sentence "It dissolves in concentrated alkali to yield chromite ions." is confusing. What is a "chromite" ion? The article for chromite shows it as including iron! Did it mean to say chromate?

--RProgrammer (talk) 16:43, 13 August 2018 (UTC)

Thank you for your proofreading. Keep it up. Chemists sometimes are lazy when it comes to describing something dissolving. For inorganic compounds, dissolving usually means conversion to another compound that happens to be soluble in the dissolving agent. Fe "dissolves" in acid, but evaporation of the resulting solution does not give back Fe, but some iron chloride. Most organic compounds, which are molecular, actually do dissolve. --Smokefoot (talk) 18:47, 13 August 2018 (UTC)