Page:Text-book of Electrochemistry.djvu/262

 XV.

��NEUTRALISATION ELEMENT.

��transformed into electrical energy than in presence of hydrochloric acid. According to this view,

SnCla in KOH | SnCU in HQ

is a kind of concentration element with respect to hydrogen ions, which are present to a large extent in the hydrochloric acid solution, but only occur in small quantity in the alkali solution.

Chlorine in potassium hydroxide behaves in the same way towards chlorine in potassium chloride. In the former solution it is reduced by the hydrogen ions to hydrochloric acid.

��SnCljinKOH. . . NaSH ......

Hydroxylamine in KOH Chromous acetate Id KOH Pyrogallic acid in KOH Hydroquinono in KOH Zinc hydrosnlphite. . Potassium ferro-oxalatc Chromous acetate. . Potassium ferrocyanide Iodine in KOH. SnCl, in HCl. . Potassium arsenite NaHjPO,

��Na^SA

��NajSOj Na,HPO, FeSO,. Hydroxylamine in HCI

��VoUs.

��NaHSOj

H,SO,

Ferrous sulphate in H^SO^ * Potassium ferrioxalate. .

Iodine in KI

Potassium ferncyanide. . Potassium bichromate. . Potassium nitrite in HjSO^. Chlorine in KOH ....

Ferric chloride

Nitric acid

KClO^inH^SO^. . . . BfjinKOH .......

H^CrA

��KCIO3 in HgSO, BrginKBr. . KIOjinHjSO,. MnOjinHCl. . CljinKCl. . KMnO^ in H^SO,

��Volts.

��Neutralisation Element.— In the following element electrical energy is produced on account of the neutralisation process which takes place : —

PdH I OHK I XO3K I NO3H I HPd. It gives —

Pd I H2O I KNO3 I KNOa I HHPd, and therefore the process consists of the transformation of

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