Inorganic Color Standards for Colorimetric Hydrogen Ion Determinations

Abstract

Aside from the wide commercial use of indicators to determine hydrogen ion concentration, there is a distinct tendency to emphasize this colorimetric method in physiological chemistry texts, and to include it as a study supplementary to potentiometrlc methods in physical chemistry texts. The simplicity of the method renders its use possible, even for the first year student. The only obstacle to its wider adoption in schools is the cost of indicator standards. Colored inorganic salt solutions seem to offer a possible solution of the problem.