The new international encyclopaedia . Fig. 4. t==r=. mated zinc immersed in it (Fig. 4). Within thezinc cylinder is a porous pot containing strongnitric acid (HXO,) and a prism of dense hydrogen ions from the sulphuric acid areintercepted on their way to the positive elec-trode by oxygen from the nitric acid, and areoxidized with the production of water. The nitricacid molecule is broken up and yields a brownish-red gas which is very corrosive and irritating. Tub Chromic Acid Cell usually consists of aplate of zinc between two of carbon dipping intoa vessel containing
The new international encyclopaedia . Fig. 4. t==r=. mated zinc immersed in it (Fig. 4). Within thezinc cylinder is a porous pot containing strongnitric acid (HXO,) and a prism of dense hydrogen ions from the sulphuric acid areintercepted on their way to the positive elec-trode by oxygen from the nitric acid, and areoxidized with the production of water. The nitricacid molecule is broken up and yields a brownish-red gas which is very corrosive and irritating. Tub Chromic Acid Cell usually consists of aplate of zinc between two of carbon dipping intoa vessel containing dilutesulphuric acid, to whichis added either chromicacid or the bichromateof potassium or sodium salt is muchto be preferred to thepotassium salt. When thebichromates are used anadditional quantity ofsulphuric acid is neededto liberate chromic acid,which is the real depolar-izer. Fig. 5 illustratesone form of this cell,which is very convenient,liut is open to the objec-tion that since the car-bon plates are usually leftstanding in the solution
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