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Buffer Index and Buffer Capacity for a Simple Buffer Solution

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Veronica Chiriac and Gabriel Balea

Department of Pharmacy, University of Medicine & Pharmacy, Timisoara, RO-1900, Romania

J. Chem. Educ., 1997, 74 (8), p 937

DOI: 10.1021/ed074p937

Publication Date (Web): August 1, 1997

Section:

History, Education, and Documentation

Abstract

Many papers that present the buffering effect of the simple buffer solution consider the notion of buffer index and buffer capacity as being equivalent. Moreover, IUPAC defies them as the same thing. According to the definition of the authors who have introduced these two units, the paper shows that there is a large difference between them. The buffer index can be defined as the differential ratio of the increase in the amount of strong acid or strong base added, to pH variation. The buffer capacity is numerically expressed to be equal with the minimum concentration of strong acid or strong base which causes the variation of buffer's pH with one unit. The field of application of both notions is different: the buffer capacity is used in the quantitative chemical analysis and the buffer index in studying biological systems.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Subject):

Theoretical Chemistry

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Understanding, Deriving, and Computing Buffer Capacity
Edward T. Urbansky and Michael R. Schock
Journal of Chemical Education2000 77 (12), 1640
- Understanding, Deriving, and Computing Buffer Capacity
  Edward T. Urbansky and Michael R. Schock
  Journal of Chemical Education2000 77 (12), 1640
  The concept of buffer capacity appears in varied disciplines, including bio-, geo-, analytical, and environmental chemistry, physiology, medicine, dentistry, and agriculture. Unfortunately, however, derivation and systematic calculation of buffer capacity ...
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