The new international encyclopaedia . toward the copper elec-trode, and are there deposited as metallic SO, ions go to the zinc electrode with theirnegative charges, as in the case of the simplevoltaic cell. When the zinc is immersed in dilute zinc sul-phate, both sulphates undergo partial dissocia-tion, and no hydrogen ions are then zinc and cop-per ions travel tow-ard the copper elec-trode. The zinc ionsare not deposited onthe co])])er plate, be-cause zinc in coppersulphate invariablyreplaces the copper,fcuming ZuSO, inplace of the CuSO,.Zinc sulphate isformed at the
The new international encyclopaedia . toward the copper elec-trode, and are there deposited as metallic SO, ions go to the zinc electrode with theirnegative charges, as in the case of the simplevoltaic cell. When the zinc is immersed in dilute zinc sul-phate, both sulphates undergo partial dissocia-tion, and no hydrogen ions are then zinc and cop-per ions travel tow-ard the copper elec-trode. The zinc ionsare not deposited onthe co])])er plate, be-cause zinc in coppersulphate invariablyreplaces the copper,fcuming ZuSO, inplace of the CuSO,.Zinc sulphate isformed at the nega-tive, and metallii-copper is depositedon the copper elcctrode. At the sametime there is a loss ofcopper sulphate cor-resixmding exactly tothe increase of zinc sulphate. The Daniell cell isone of the most constant elements yet devised,for in it polarization by hj-drogen is entirelyavoided. The CtRAvitt Cell is a modified Daniell (). The porous pot is omitted, the partial sep-aration of the liquids being secured by difference. FjG. 3. GRAVITY CELL. VOLTAIC CELL. 210 VOLTAIC CELL. in density. The copper electrode is placed at thebottom in saturated copper sulphate, while thezinc is suspended near the top in a weak solu-tion of zinc sulphate. The zinc should never beplaced in the copper sulphate solution. The satu-rated copper sulphate is more dense than thedilute zinc salt; it therefore remains at thebottom, except as it slowly diffuses upward. The Buksen Cell, devised by Bunsen in 1841,consists of a glass jar containing dilute sul-phuric acid, and a hollow cylinder of amalga- It is known as a plunge battery, and is con-venient for experimental work. The Edison-Lalakde Cell is an example ofthe use of a solid depolarizer, namely, l>lackoxide of copper. It was originally due to electrolyte is a solution of caustic soda, onepart of the alkali to three of water by the cell is working, the zinc forms with thealkali sodium zincate, which is soluble,
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