1844 Daniell] ABSTRACT 1 5 



X840. J. F. Daniell. 



Second letter on the Electrolysis of Secondary Compounds. Addressed to 

 M. Faraday. Phil. Trans., ijo, 209. 



The author electrolyzed various solutions in an apparatus 

 consisting of two electrode compartments connected to a third 

 cell by a siphon with partitions of membrane. The total elec- 

 trolysis was determined by measuring the gases evolved. The 

 solutions in each of the three cells were analyzed. In the ex- 

 periments with caustic alkalis the membranes were replaced by 

 porous earthenware. 



1844. J. F. Daniell and W. A. Miller. 



Additional Researches on the Electrolysis of Secondary Compounds. Phil. 

 Trans., 134, i ; Pogg. Ann., 64, 18. 



Apparatus : a horizontal cylinder divided into three compart- 

 ments by vertical partitions of bladder. The Pt electrodes were 

 placed in the end compartments which were provided with tubes 

 for collecting the gases evolved. A water voltameter was placed 

 in the circuit. 



Experiments with copper sulphate, zinc sulphate, and ammo- 

 nium chloride showed that the cation was not moved by the 

 current. For potassium sulphate, barium nitrate, and calcium 

 sulphate, the migration values were respectively w = |, « = |, 

 n = \\. Semi-quantitative experiments showed that both ions 

 were moved in the cases of sodium tungstate, potassium chro- 

 mate, potassium arsenite, and sodium carbonate ; in the case of 

 sodium chloride the chlorine was moved in greater amount than 

 the sodium. 



Further experiments were carried out with copper sulphate, 

 aluminium sulphate, ferric sulphate, magnesium potassium sul- 

 phate, potassium aluminium alum, potassium copper sulphate, 

 potassium sulphocyanide, potassium cyanide, potassium ferro- 

 cyanide, potassium ferricyanide, potassium sulphate, ammonium 

 oxalate, potassium arsenite, potassium arseniate, sodium sul- 

 phite, sodium hyposulphite, and the phosphates of sodium. 



