A Method for the Identification of Pure Organic Compounds, Vol. 1: By a Systematic Analytical Procedure Based on Physical Properties and Chemical Reactions (Classic Reprint) - Tapa blanda
Sinopsis
Excerpt from A Method for the Identification of Pure Organic Compounds, Vol. 1: By a Systematic Analytical Procedure Based on Physical Properties and Chemical Reactions
The phrase More Important Compounds used in the title is unavoidably indefinite; but the intention has been to admit all substances to the tables for which there is more than a remote chance that they may come into the hands (if the analyst as unknown compounds. Such a list naturally includes: first, all com pounds that may be isolated in a state of purity and without excessive difficultv from materials used in the arts, or from substances which occur somewhat abun dautly in Nature; second, compounds of minor importance which may easily be formed in the laboratory as by-products in reactions between substances of more common occurrence; third, many rare compounds which have acquired a general scientific interest either on account of their properties or as representatives of peculiar types. Very few compounds that could be purchased in the market in a state of purity have, been omitted except through oversight. The most important intentional omissions are: substances whose claims to recognition as distinct chemical species are not generally accepted; uncrystallizable syrups that cannot be distilled without decomposition; the oily and fatty glycerides; those glucosides and synthetic sugars of which specimens could not be obtained for examination.
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Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Reseña del editor
Excerpt from A Method for the Identification of Pure Organic Compounds, Vol. 1: By a Systematic Analytical Procedure Based on Physical Properties and Chemical Reactions
The phrase More Important Compounds used in the title is unavoidably indefinite; but the intention has been to admit all substances to the tables for which there is more than a remote chance that they may come into the hands (if the analyst as unknown compounds. Such a list naturally includes: first, all com pounds that may be isolated in a state of purity and without excessive difficultv from materials used in the arts, or from substances which occur somewhat abun dautly in Nature; second, compounds of minor importance which may easily be formed in the laboratory as by-products in reactions between substances of more common occurrence; third, many rare compounds which have acquired a general scientific interest either on account of their properties or as representatives of peculiar types. Very few compounds that could be purchased in the market in a state of purity have, been omitted except through oversight. The most important intentional omissions are: substances whose claims to recognition as distinct chemical species are not generally accepted; uncrystallizable syrups that cannot be distilled without decomposition; the oily and fatty glycerides; those glucosides and synthetic sugars of which specimens could not be obtained for examination.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Reseña del editor
Excerpt from A Method for the Identification of Pure Organic Compounds, Vol. 1: By a Systematic Analytical Procedure Based on Physical Properties and Chemical Reactions
At the time of writing the only general and fairly systematic procedure for the identification of previously described organic compounds of all classes is that which may be conveniently designated the Method of the Empirical Formula. In following this procedure a determination of the percentage composition is first made. The molecular weight is next determined or conjectured. From these data an empirical formula is calculated. The properties of the substance are then compared with those of all the known compounds possessing this formula by reference to their scattered literature, for which Richter's "Lexicon der Kohlenstoff-Verbindungen" with its supplements now furnishes a very complete index. Resting, as it chiefly does, on the two fundamental properties, percentage composition and molecular weight - which alone among the chemical constants can be readily calculated for every compound in advance of its discovery - it is probable that this method will long remain the last resort in all earnest attempts to establish the identity of compounds which have been previously undescribed or very imperfectly characterized through their physical and chemical properties. Nevertheless, when we turn to the great body of well-characterized compounds that occur with some frequency in the products of Nature, the useful arts, and the scientific laboratory, there is good reason to raise the question whether the Method of the Empirical Formula is from the practical standpoint a sufficiently satisfactory one. It is evidently not, if any substitute can be found that will lead the analyst to the same results with less expenditure of time and effort, and without requiring unusual knowledge or skill on his part; and it is not to be denied that in these respects this method makes a very poor showing. The indispensable key to its use is proficiency in ultimate organic analysis, whose difficult technique is fully mastered only by long practice. The performance of the combustions, which must be made in duplicate to secure certainty, is at best a time-consuming operation; and even after reliable results have been obtained, it is further necessary, in order to fully identify a compound, to resort to a study of its physical properties, chemical behavior, and perhaps to a molecular-weight determination. The consequence of this has been that the identification of organic compounds by this general method has been practically limited to its occasional employment in laboratories devoted to synthetic organic research, and that such identifications when attempted elsewhere are usually accomplished, often with uncertain results, by the use of disconnected desultory tests. Through these considerations, and with the belief that a path of less resistance could be broken out for the analyst, the writer began more than eight years ago the studies whose first results appear in this volume.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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A Method for the Identification of Pure Organic Compounds, Vol. 1
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Paperback. Condición: New. Print on Demand. This book is a guide to identifying organic compounds that are composed solely of carbon, hydrogen, and oxygen. It builds upon a method of classification previously developed by the author to include nitrogen or nitrogen and oxygen. In this volume, the author presents 2300 compounds, selected for their relevance either through scientific or industrial use, or for their occurrence in nature. The compounds are arranged using an innovative classification system that organizes them by their qualitative elemental composition, behavior in chemical tests, melting point, and boiling point. The name of each species is followed by a brief characterization, specific chemical tests, and detailed instructions. The author's method represents a significant shift from past identification methods, which have relied heavily on ultimate organic analysis. This approach, instead, gives fuller recognition to the importance of more easily determined properties like qualitative elemental composition, color, melting point, and solubility. As a result, the analyst is led to the same results with less expenditure of time and effort, and without requiring unusual knowledge or skill. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Nº de ref. del artículo: 9781332592074_0
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A Method for the Identification of Pure Organic Compounds, Vol 1 By a Systematic Analytical Procedure Based on Physical Properties and Chemical Reactions Classic Reprint
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A Method for the Identification of Pure Organic Compounds, Vol 1 By a Systematic Analytical Procedure Based on Physical Properties and Chemical Reactions Classic Reprint
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PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000. Nº de ref. del artículo: LW-9781332592074
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