Quantitative chemical analysis by electrolysis / by Alexander Classen in co-operation with Walter Löb ; authorized translation ... by William Hale Herrick and Bertram B. Boltwood.

  • Classen, Alexander, 1843-1934. Quantitative Analyse durch Elektrolyse. English
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: Quantitative chemical analysis by electrolysis / by Alexander Classen in co-operation with Walter Löb ; authorized translation ... by William Hale Herrick and Bertram B. Boltwood. Source: Wellcome Collection.

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    PREFACE TO FOURTH EDITION. The present edition, revised witli the assistance of Dr. Lob, differs from the previous editions in that tlie Introduc- tion has been augmented by the insertion of a section devoted to theory. This was made the more necessary, since the in- vestigations of recent years have been chiefly devoted to the exphination of the reactions in sohitions, and the determina- tion of tlie electrical magnitudes. The necessity of specific directions concerning electrode tension, current strength and decomposition tension has been demonstrated. Tlie author, witli tlie co-operation of his assistants, lias experimentally determined these electrical magnitudes, not only for his own methods for the determination and separation of the metals, but also for a number of other methods, and has incorporated them in the text. Additional methods by other authors, in which directions concerning these important factors arc want- ing, have been omitted, in consideration of the fact that these are either uncertain or entirely impractical; mention of them has, however, been made in the references to the literature. The book has been made more complete by the description of various measuring instruments, sources of current and apparatus; together with an explanation of simple and com- plete appliances for carrying out electrolytic experiments. These have been illustrated by a large number of new cuts in the text and in the appended tables. The publishers have spared neither pains nor expense to make these new illustrations as perfect as possible; I feel called upon to express here my full appreciation of this fact. A. Classen. Aachen, January 18, 1897.