Revised Standard Values for pH Measurements from 0 to 95 °C
260 ## - PUBLICATION, DISTRIBUTION, ETC.
Name of publisher, distributor, etc.
[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology,
Date of publication, distribution, etc.
1962.
500 ## - GENERAL NOTE
General note
/pmc/articles/PMC5315334/
520 ## - SUMMARY, ETC.
Summary, etc.
Seven standard solutions serve to fix the NBS conventional activity scale of pH (termed pH(s)) from 0 to 95° C. The original emf data have been re-examined and the values of the acidity function p(α(H)γ(Cl)), from which pH(s) is derived, have been recalculated with the use of a single consistent set of standard potentials and electrochemical constants. The convention proposed recently by Bates and Guggenheim for the numerical evaluation of the individual activity coefficient of chloride ion in the buffer solutions has been adopted, and by this means pH(s) values to the third decimal have been assigned. These "experimentar" pH(s) values in the temperature range 0 to 95 °C have been smoothed as a function of temperature by least-squares treatment. The properties and uses of the standards are discussed and directions for the preparation of the solutions are given.
540 ## - TERMS GOVERNING USE AND REPRODUCTION NOTE
Terms governing use and reproduction
540 ## - TERMS GOVERNING USE AND REPRODUCTION NOTE
540 ## - TERMS GOVERNING USE AND REPRODUCTION NOTE
Terms governing use and reproduction
The Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
546 ## - LANGUAGE NOTE
Language note
en
690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN)
