Talk:Permanganate

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

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, [MnVIIO4] and perchlorate, [ClVIIO4], are isoelectronic. Their valence electron configurations are both ns2 np6.
Ben (talk) 18:24, 29 August 2008 (UTC)

Oxidation positive result[edit]

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

"Not to be confused with pomegranate" :-D[edit]

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

Vandalism[edit]

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)

Conflicting claims in french and english versions[edit]

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)

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)

History[edit]

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 (talkcontribs)