University Chemistry ›› 2024, Vol. 39 ›› Issue (4): 382-386.doi: 10.3866/PKU.DXHX202310043

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A Formula for the Calculation of Complex Concentrations Arising from Side Reactions and Its Applications

Cunling Ye1, Xitong Zhao1, Hongfang Wang1, Zhike Wang2   

  1. 1 College of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, Henan Province, China;
    2 Institute of Environment, Henan Normal University, Xinxiang 453007, Henan Province, China
  • Received:2023-10-10 Revised:2023-11-22 Published:2023-12-05

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Abstract: In complexometric titration, ethylenediaminetetraacetic acid (EDTA), commonly referred to as Y, is the titrant of choice. This system often encompasses various side reactions. This paper derives a formula at the stoichiometric point, based on the side reaction coefficient (α), for calculating the concentration of NY or ML coordination compounds with a coordination ratio of 1 : 1, where NY represents the complex of ligand Y with coexisting metal ions (Nn+), and ML denotes the complex of the target metal ions (Mn+) with other ligands (L). The formulation significantly streamlines the computation of these complex concentrations.

Key words: Complexometric titration, Side reaction coefficient, General formula