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VI.—On the Reducing Action of Electrolytic Hydrogen on Arsenious and Arsenic Acids when liberated from the Surface of Different Elements
Published online by Cambridge University Press: 15 September 2014
Extract
This research was commenced with a view to find the velocity at which arsenic was liberated as arseniuretted hydrogen from cathodes of different elements:
(a) From arsenic in the form of arsenious acid.
(b) „ „ „ „ arsenic acid.
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- Copyright © Royal Society of Edinburgh 1909
References
page 84 note * Memoirs and Proceedings of the Manchester Literary and Philosophical Society, vol. xlviii. part iii., No. 17.
page 85 note * The following metals were used in the form of cylinders:—Lead, zinc, cadmium, and tin.
Iron was used in a cylindrical form made by wrapping pure iron wire on a cylinder of glass, giving about the same surface exposed to the electrolyte as the metallic cylinders.
The graphite electrode was cut in the form of a rectangular block giving about the same surface as the cylinder, and all the others were used in the sheet form; but it was found that the area of the cathode did not materially affect the result.
page 86 note * Chapman, and Law, on ‘The Reducing Action of Hydrogen,’ part ii., ‘The Estimation of Traces of Arsenic by the Marsh-Berzelius Method and the Insensitiveness of Zinc,’ Analyst, 1906, vol. xxxi., p. 3CrossRefGoogle Scholar.
page 86 note † “Supertension” of an electrode, according to Caspari (“Ueberspannung,” Zeit. physical Chem., 1899, xxx., 89) is the excess of electromotive force necessary for the liberation of hydrogen at that electrode over the electromotive force required for the reversible production of hydrogen on a cathode of platinised platinum
The values of the “excess-voltage” or supertension for different metals are given by Caspari in his paper, and also in Lehfeldt's Electrochemistry, part i., p. 176.