Potentiometric Titration Based on the Reference Electrode Equipped with Ionic Liquid Salt Bridge — 1. Precipitation Titration of Chloride with Silver Ions in Water

A reference electrode equipped with ionic liquid salt bridge consisting of tributyl(2-methoxyethyl)phosphonium bis(pentafluoroethanesulfonyl)amide has been employed for potentiometric precipitation titration of chloride with silver ions in water at 25 °C. A model for the titration curve was regresse...

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Bibliographic Details
Published in:Denki kagaku oyobi kōgyō butsuri kagaku 2023-01, Vol.91 (1)
Main Authors: KAKIUCHI, Takashi, TANIGO, Ryunosuke, TANI, Atsushi, YAMAZAKI, Takeshi, KOMATSUBARA, Kohta, NAKANO, Keiji, YAMAMOTO, Masahiro
Format: Article
Language:eng ; jpn
Subjects:
Activity coefficients
Chlorides
Electrodes
Ionic liquids
Ions
Least squares
Potentiometric titration
Titration
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Summary:A reference electrode equipped with ionic liquid salt bridge consisting of tributyl(2-methoxyethyl)phosphonium bis(pentafluoroethanesulfonyl)amide has been employed for potentiometric precipitation titration of chloride with silver ions in water at 25 °C. A model for the titration curve was regressed to experimental curves, taking into account the change in the activity coefficients of relevant ionic species in the course of the titration, to obtain the least square estimates of two adjustable parameters in the model, the solubility product (Ksp) and the analyte concentration. The least-square estimate of Ksp, (1.840 ± 0.060) × 10−10, i.e., pKsp = 9.736 ± 0.014, is in good agreement with literature data, but with higher precision.
ISSN:1344-3542
2186-2451
DOI:10.5796/electrochemistry.22-66119