Talk:Castner–Kellner process

"uses an electrolyte of sodium chloride solution, a graphite anode (A), and a mercury cathode (M). The other type of cell, shown in the center of the diagram, uses an electrolyte of sodium hydroxide solution, a mercury cathode (M), and an iron anode (D)."

This description is inconsistent with the diagram and also not correct. A and D cannot both be anodes.Eregli bob (talk) 13:23, 6 February 2011 (UTC)

:The process described is not consistent with the description in Pauling. However that version of the process is itself out of date. The original process used a rocking tank to move the mercury between tank compartments. The modern version (eg used by ICI and its successors) uses pumps to move the mercury/amalgam between separate tanks. (As a student I worked in the quality control lab associated with one of these plants.) In both of these processes there were no iron anodes, only (multiple) graphite ones (now superceded by titanium). The process had a dual purpose, to produce chlorine and sodium hydroxide. Sodium hypochlorite was a commercial by-product. There's more info here: [http://en.wikipedia.org/wiki/Chlorine_production#Mercury_cell_electrolysis] Sasha (talk) 16:10, 5 June 2011 (UTC)

:Indeed there cannot be two anodes, one, in addition, being positive, whilst other - negative! The iron electrode is unambiqiously CATHODE, as a reduction (H₂O -> OH^-)takes place on it. Mercury layer is a kathode for the outer cell (as on the figure) and simultaneously the anode of the inner cell (Na is oxidized to form Na⁺).--Esmu Igors (talk) 19:53, 19 April 2012 (UTC)

::Ooops, I have recognized now: there HAS already been iron described as cathode. But further in text was still "iron anode", so I must apologize for emotionally arguing :) --Esmu Igors (talk) 19:56, 19 April 2012 (UTC)

Anyone could explain why in the outer cell the one that is reduced on the cathode is not water but Na⁺? Thanks.  Kenrick  Talk 13:09, 8 October 2012 (UTC)

:An extremely late reply, but in case you are still interested: the reduction of hydrogen ions to hydrogen gas at the surface of mercury is a very slow reaction. Sometimes this is expressed by saying the reaction has a high overpotential. By contrast, the reduction of sodium ions to elemental sodium is rapid. Dezaxa (talk) 13:39, 10 October 2023 (UTC)

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