VOL.9, NO. 9
RECENT BOOKS
1669
tive form used by John Wilep and Sons, Inc. Space does notpermit of a detailed review and it does not seem necessary, as every American chemist will want to be personally acquainted with any book by such an eminent authority and teacher as Professor Emich. RALPn T. K. CORNWELT.
particular, (1) in the paragraphs appearing in Chapter I under the heading "Theory of Solutions" i t could logically be shown what modification of the Arrhenius theory is now necessary. But no mention is made of the effect of interionic forces on the mobilities of the ions, and of the fact that even far weak electrolytes the simple AlA , ratio does not give the true degree of dissociation. (2) I n connection with the colorimetric method and the quinhydrone electrode salt effects arc discussed, with Hydrogen Ions. HUBERT T. S. B n r r r o ~ , the presentation of many data, hut no B.Sc.Bristo1. D.I.C., F.I.C., Lecturer in fundamental treatment of these effects is Physical Chemistry, University College given. (3) Although the author conof the South-West of England, Exeter. stantly speaks of pH as the logarithm of Second edition. D. Van Nostrand Co., the reciprocal of the hydrogen-ion concen589 tration, he bases its determination upon Inc., New York City, 1932. xvi pp. 124 Figs. 13 X 22 m. $9.00. the electrometric method. He makes no attempt to explain the confusion arising I n the preface t o the first edition the from the employment of several definitions author states that he has endeavored: of pH. (4) The kinetic method of deter"firstly, to provide a practical discussion mining hydrogen-ion concentration is of the various eledrometric and coloriomitted. (5) The extended theory of metric methods of determining the concenacids and bases is not considered. tration of hydrogen ions; secondly, t o I n spite of its failure t o present conshow the fundamental importance of hysistently and dearly the theory underlying drogen-ion concentrations in general chemthe determination of hydrogen-ion canistry, including volumetric and gravimetric centiation, the book has much to recomanalytical procedures; and, finally, t o mend it. For one desiring practical inindicate the important r6Ies played by formation about the determination of pH, hydrogen-ion concentrations in numerous its value as a control in analvtical chemindustrial chemical processes, and how the istry and in numerous industrial processes, various methods of measuring hydrogen"Hydrogen Ions." second edition, is a ion concentrations have been employed for storehouse of information. the purpose of control." I n the preface to MARTIN KILPATRICK, JR. the second edition he states, "Every effort UNIVBRS~TY on PBNNSYLVANIA has been made. . .to bring the matter upPHILADBLPHIA, PBNNA to-date in all of its many ramifications. I n view of the inneasing acceptance of the The Donnan Equilibria and Their ApplicaDebye-Huckel-Lewis theory of electrotion to Chemical, Physiological, and lytes, a chapter has been inserted in this Technical Processes. T. R. BOLAM. edition (Chapter XI) which aims a t proM.Sc. (Bristol), D.Sc. (Edinburgh), viding an adequate discussion of the theLecturer in Chemistry in the University ory, inasmuch as i t relates t o the several of Edinburgh. G Bell & Sons. Ltd., factors involved in the study of the acLondon, 1932. vii 154 pp. 14 X tivity of hydrogen ions " 22 cm. 9s. net. If the subject is to be brought up-to-date it is not sufficient, in the opinion of the As stated in the preface this book gives reviewer, t o insert a chapter on the Debye- the *st detailed survey, with references to Hiickel theory, neglecting modern theevery development of importance, of the ory throughout the rest of the book. I n whole subject of the "Doman Equilibria!'
+
+
