Talk:Manganate
Latest comment: 17 years ago by Shjacks45 in topic from the industrial end
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Article structure
editI am starting to wonder if we should not have a short article on manganate and the longer one with chembox on K2MnO4.--Smokefoot 00:18, 26 April 2006 (UTC)
Formula
editI think the formula is wrong. Elsewhere this site describes permanganate as having four oxygens... and this says that Manganate has four oxygens. And I have several textbooks that list MnO32- as manganate.76.20.62.74 03:22, 5 September 2007 (UTC)
from the industrial end
editbackround: printed circuit boards
- We monitored alkaline permanganate baths as CO2 and organic acids and drag in degraded alkalinity. Drag out and usage lowered permanganate. The reaction of permanganate OH and ene moities results in Mn(+5) which disproportionates to MnO2 (sticks to board, conductive coating treated with polysulfide reductant) and Mn(+6) which more slowly disp to permanganate.
- Bath was heated to 60 C, pH about 10.4. Standard methods to analyze was add a few drops conc Ba(OH)2 solution, filter, titrate filtrate with standardized thiosulfate. Weigh filtrate for manganate.
- Point is that this is standard test method and permanganate solution doesn't turn green with conc Ba(OH)2 solution. I've double checked this by doing titration of bath without manganate removed.
- By the way since we mention chromate why don't we mention ferrate(+6)? —Preceding unsigned comment added by Shjacks45 (talk • contribs) 23:46, 14 October 2007 (UTC)