Chem. COPYRIGHT, 1925, BY THE CENTURY CO. PRINTED IN U. S. A. THE author wishes to acknowledge his particular appreciation of the generous assistance given him by his colleague, Professor Hal T. Beans, whose constructive suggestions and advice not only with respect to the presentation of the theory, but also with respect to the details of the procedures and to the arrangement of the book as a whole, have been invaluable. Since the author, as a student, was fortunate enough to come under the tuition of Professor Beans and later, as a teacher, to be associated with him in the same department, it is only paying the most modest of tributes to say that a very large part of the spirit of this work is but the natural reflection of this association. The author also wishes to express his thanks to the following gentlemen for the assistance which they have severally rendered, often at personal sacrifice to themselves: Dr. Rocco Fanelli, for putting in finished form the details of many of the procedures and for furnishing numerous examples along with their answers; Mr. Harvey B. Williams, for help in preparing the manuscript, gathering and verifying many citations, and correcting the proof; Dr. George Barsky and Dr. Stephen P. Burke, for obtaining the data for the various titration curves; Mr. Sidney J. Ballard and Mr. Henry E. Sharpe, for constructing the drawings and graphs. Acknowledgment is also made to the host of workers whose articles we have cited and to any others whose work we have unwittingly failed to cite or locate. New York City. HAROLD A. FALES. PREFACE It has been the aim of the author in preparing this work to apply the principles of Physical Chemistry to the theory of Quantitative Analysis in the same detailed and thorough manner that has been done in the last decade or so to the teaching of Qualitative Analysis and of General Chemistry as well. In stressing this point of view it has not been forgotten, however, that the two other aspects of the subject, namely, Technique and Methods, also play an equally important part in the education of the analyst. Accordingly, it will be found that technique has been treated in great detail, perhaps in too great detail, but it is felt that by so doing both the instructor and the student will be enabled to save the time that otherwise would have to be devoted in the laboratory to a discussion or demonstration of the subject. The methods which have been given in the text will be found sufficient not only for an elementary course but also for an advanced course as well; they have been selected so as to present something new in theory or technique in every case, and have been arranged progressively with respect to their general order of difficulty. Perhaps the dominant feature of the text is the manner in which it presents the theory. It will be found, we believe, that this work treats the theory more comprehensively and with greater thoroughness than does any other similar textbook. The customary division of the subject into gravimetric and volumetric methods on the basis of the technique employed has been abandoned, and in its place the development of the subject is based on the fundamental principles which are involved; these are presented in the following order: (1) precision, (2) weighing, (3) measurement of volumes, (4) neutralization, (5) solubility product, (6) oxidation-reduction, and (7) evolution and measurement of gases. While any arrangement of this kind is in a sense arbitrary, it is felt that there is sound logic in putting neutralization before solubility product because in the former the student becomes well acquainted with the subject of hydrogen ion concentration, a factor which enters into all analytical procedures and, therefore, demands attention from the very outset. Numerous examples are appended to the chapters, along with their answers. These examples are of a practical nature and illustrate the points covered in the chapters to which they are attached. The references throughout the book are unusually complete for a work of this nature and will be found of marked convenience, not only to instructors and students, but to persons who are out in practice. Full citations have been given in each case, and an author and subject index has been added to facilitate investigation. In the make-up of the book the paragraph numbering system has been used for references and to make easy the assignment of work. The text contains numerous illustrations and diagrams. Great care has been taken to make each of these accurate and of a size that is both convenient and clear in every detail. There are also numerous tables, giving physical-chemical and other useful data. While every effort has been made to have the book free of mistakes, it is recognized that some errors will be found; therefore, the author will feel obligated to any one who is kind enough to call such mistakes to his attention. New York City. HAROLD A. Fales. |