University Chemistry ›› 2023, Vol. 38 ›› Issue (2): 233-238.doi: 10.3866/PKU.DXHX202204009

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Discussion of Correspondence and Regularity Problem in Deriving and Applying Distribution Fraction Calculations

Kaiti Abulizi Xiao, Mulati Areyi, Ronglan Wu()   

  • Received:2022-04-06 Accepted:2022-05-26 Published:2022-06-07
  • Contact: Ronglan Wu


The calculation of equilibrium concentrations of each component in the acid-base system is a critical knowledge point in teaching analytical chemistry. Its teaching impact depends on the mastery of the derivation, application, and potential meaning of the distribution fraction (δ) formula. The derivation and application of δ as the focus are time-consuming and tedious. δ has good application in calculating the pH, concentration of each species in the acid-base and complex system, buffer capacity, and titration error. In this study, the methods for the rapid derivation and convenient application of δ in n-ary acid-base solutions were examined. The application of this study helps stimulate students' interest, improve cognition, and enhance understanding.

Key words: Analytical chemistry, Distribution fractions, Distribution curve, Acid-base systems