Talk:Permanganate

Isoelectronic?

Is this stuff isoelectronic with perchlorate? --83.100.0.21 (talk) 15:41, 29 August 2008 (UTC)[reply]

Mn(VII) is [Ar] 3d⁰ 4s⁰, i.e. just [Ar] = 1s² 2s² 2p⁶ 3s² 3p⁶.

Cl(VII) is [Ne] 3s⁰ 3p⁰, i.e. just [Ne] = 1s² 2s² 2p⁶.

So, yes, manganate, [Mn^VIIO₄]⁻ and perchlorate, [Cl^VIIO₄]⁻, are isoelectronic. Their valence electron configurations are both ns² np⁶.

Ben (talk) 18:24, 29 August 2008 (UTC)[reply]

Oxidation positive result

It goes from purple to brown. Mbslrm (talk) 03:26, 6 October 2009 (UTC)[reply]

"Not to be confused with pomegranate" :-D

Hehe, who wrote that, that's brilliant :P telewatho (talk) 15:15, 13 June 2010 (UTC)[reply]

Vandalism

This page is getting vandalized by non-registered people. 195.195.239.152, on 19 September 2012 changed the correct equation 2 MnCl2 + 5 NaClO + 6 NaOH → 2 NaMnO4 + 9 NaCl+ 3 H2O into 2 MnCl2 + 4 NaClO + 2 NaOH → 2 NaMnO2 + 6 NaCl+ 3 H2O and it went unnoticed. Vmelkon (talk) 22:01, 2 October 2012 (UTC)[reply]

Conflicting claims in french and english versions

According to the french version of this page:

Le permanganate en solution aqueuse oxyde l'eau en dioxygène. Bien que cette réaction soit très lente, elle peut changer le titre de la solution.

Here is a proposed translation:

Aqueous permanganate oxidizes water to form oxygen. Although this reaction is very slow, it has an impact on the solution titration.

While the english version claims that water oxidation doesn't happen:

According to theory, permanganate is strong enough to oxidize water, but this doesn't actually happen to any extent.

Miloud90 (talk) 18:35, 28 April 2016 (UTC)[reply]

According to T. Rees, J. Chem. Educ. 1987 64, 1058, this reaction is catalysed by MnO₂, and will slowly change the concentration of permanganate present. Whether the loss of permanganate is a significant issue in any given situation depends on the age of the solution, the concentration of impurities that generate MnO₂, and the accuracy required. --Ben (talk) 19:18, 28 April 2016 (UTC)[reply]

History

I'd like to see more history in these articles. For instance, I gather they wouldn't have had manganese violet 2,000 years ago, but what about other manganese-based pigments and chemistry (presumably as a by-product of iron chemistry)? Vince Calegon 18:21, 24 March 2017 (UTC) — Preceding unsigned comment added by Vince Calegon (talk • contribs)

Use as a disinfectant

Currently the article describes permanganate as being used as a disinfectant, in a weird mix of uncertainty ("used regularly to sanitize baths ... or anything general like that") and absolute certainty ("[i]t is a cheap and extremely effective compound for the task"). I'm not actually sure that belongs on this page, since all I can seem to find reference to online is potassium permanganate being used as a disinfectant, rather than permanganates in general or permanganate ions on their own.

I don't know enough about disinfectants to know if this section should just be removed or if it could be expanded on. Rydwolf (talk) 19:58, 3 November 2023 (UTC)[reply]