Wt. Durand.

Or

QUALITATIVE CHEMICAL ANALYSIS.

BY

CHARLES W. ELIOT DEDABANENT OFOR

EDUCATION
RECEIVED

DEC 17 1929

REVISED, WITH THE CO-OPERATION OF THE AUTHORS,

LELAND STANFORD

JUNIOR UNIVERSITY

BY

WM. RIPLEY NICHOLS,

Professor of General Chemistry in the Massachusetts Institute of Technology.

FIFTH REVISED EDITION.

NEW YORK:

D. VAN NOSTRAND, PUBLISHER,

23 MURRAY STREET AND 27 WARREN STREET.

1877.

Entered, according to Act of Congress, in the year 1872, by

C. W. ELIOT, F. H. STORER and W. R. NICHOLS,

In the Office of the Librarian of Congress, at Washington,

627412

C

PREFACE.

THE authors have endeavored to include in this short treatise enough of the theory and practice of qualitative analysis "in the wet way," to bring out all the reasoning involved in the subject, and to give the student a firm hold upon the general principles and methods of the art. It has been their aim to give only so much of mechanical detail as is essential to an exact comprehension of the methods and to success in the actual experiments. Hence, the multiplication of different tests or processes, having essentially the same object, has been purposely avoided. For the same reason none of the rare elements are alluded to. The manual is intended to meet the wants of the general student, to whom the study is chiefly valuable as a means of mental discipline and as a compact example of the scientific method of arriving at truth. To professional students who wish to make themselves expert analysts, this little book offers a logical introduction to the subject, an outline which is trustworthy as far as it goes, but which needs to be filled in and enlarged by the subsequent use of some more elaborate treatise as a book of reference. Prof. Johnson, of Yale, has supplied this need with his excellent edition of Fresenius's comprehensive manual.

The authors believe that they have put into the following pages as much of inorganic qualitative analysis as is useful for training, and also as much as the engineer, physician, agriculturist, or liberally educated man needs to know. The book has been written for the use of classes in the Institute of Technology, who have already studied the authors' "Manual of Inorganic Chemistry." It is simply an implement devised to facilitate the giving of thorough