The Principles of Qualitative Analysis: From the Standpoint of the Theory of Electrolytic Dissociation, and the Law of Mass Action (Classic Reprint) - Tapa blanda

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Excerpt from The Principles of Qualitative Analysis: From the Standpoint of the Theory of Electrolytic Dissociation, and the Law of Mass Action

By compiling the present text I have sought to supply a want to which W. Ostwald, amongst others, refers in the preface to the "Scientific Foundations of Analytical Chemistry." In the practical teaching of elementary chemistry due regard has not been paid heretofore to the dissemination of new experiences and general views which are important for the comprehension of chemical phenomena. Since the appearance of the "Principles of Inorganic Chemistry " the need for a text-book which introduces modern conceptions into the teaching of qualitative analysis has become more apparent. This has led me to carry out a long cherished intention.

I have kept in view the problem of presenting the relations between the laws governing chemical reactions in an easily comprehensible manner and, as far as possible, with all exactness. By consistently applying these relations as they have been developed I have aimed to thoroughly establish their significance and also the advantages to be gained from knowing them.

Special attention has been paid to the theory of electrolytic dissociation and the law of mass action, the fundamental law governing chemical equilibria. Whenever opportunity has offered, the great importance of this law, even for qualitative experiments, has always been emphasized.

I have also aimed to define the most common conceptions that are used in general chemistry, by means of suitable illustrations, in such a way that even the beginner can soon learn to apply them correctly. As occasion demanded I have also pointed out differences in the use of certain conceptions, for instance, basicity (§ 129) and valence (§ 167).

No attempts have been made to set up constitutional formulae and to explain the nature and mechanism of chemical processes. All such questions have been left out of consideration, for to understand them without the necessary preliminary knowledge of facts makes greater demands upon the imagination than does the understanding of simple relations between the different phenomena, to which the more detailed study of the facts directly leads.

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