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

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posted on 2022-12-06, 08:29 authored by Takashi KAKIUCHI, Ryunosuke TANIGO, Atsushi TANI, Takeshi YAMAZAKI, Kohta KOMATSUBARA, Keiji NAKANO, Masahiro YAMAMOTO

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.

Funding

Fundamental Basis for New Methods of Separation and Analysis Based on the Control of Electrical Potential at Ionic Liquid| Solution Interface

Japan Society for the Promotion of Science

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Formulation of the basis for measuring ion activity in concentrated aqueous solutions and its application to high precision measurements of ocean acidification

Japan Society for the Promotion of Science

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Theoretical studies on the mechanism of the electrode interfacial phenomena by the integral equation with first-principles calculation

Japan Society for the Promotion of Science

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History

Corresponding author email address

kakiuchi.takashi.55e@st.kyoto-u.ac.jp

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© 2022 The Author(s).