HYDROGEN ELECTRODE POTENTIALS OF PHTHALATE, PHOSPHATE, AND BORATE BUFFER MIXTURES

William Mansfield Clark,Herbert A Lubs

doi:10.1016/s0021-9258(18)87472-5

William Mansfield Clark, Herbert A Lubs

Open Access

https://doi.org/10.1016/s0021-9258(18)87472-5

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Abstract

HYDROGEN ELECTRODE POTENTIALS OF PHTHALATE, PHOSPHATE, AND BORATE BUFFER MIXTURES

Highlights

At the present stage of its development the calorimetric method of determining hydrogen ion concentration requires the use of a set of comparison solutions whose hydrogen ion concentrations have been accurately determined by hydrogen electrode measurements
Hydrogen electrode potentials were corrected to the standard concerdration of hydrogen, which, contrary to the generally accepted standard’in hydrogen electrode work, we have considered to be the concentration which the gas would have at 0°C. and
There is a certain inconsistency in retaining the same concentration of potassium chloride as the salt in the form of borate increases. This might be overcome by dilution of the borate mixtures with declining volumes of a potassium chloride solution, but we have considered this unwise in view of the fact that careless errors in the volume of potassium chloride might introduce a larger effect upon the hydrogen ion concentration of the solution than the “salt error” of the present method

Summary

Introduction

At the present stage of its development the calorimetric method of determining hydrogen ion concentration requires the use of a set of comparison solutions whose hydrogen ion concentrations have been accurately determined by hydrogen electrode measurements. Of the various sets which have been proposed the most complete and reliable is that of Skensen [35, 36] This set may be supplemented by various other mixtures among which should be mentioned the acetic acid-sodium acetate mixtures carefully studied by Walpole [38], cacodylate mixtures [30, 37], and Palitzsch’s [33] boric acid-borate mixtures. We have studied a selection of mixtures which as a set seem to us to possess certain advantages over those in common use. In our selection we have been guided largely by the desire to simplify the technique of preparation and to reduce the number of substances required

Methods

Findings

Discussion

Conclusion