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Vol. 25 No. 6 (2013): Vol 25 Issue 6

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Automatic Biamperometric Titration of Copper(II) by Iodide in Some Non-Aqueous Media

https://doi.org/10.14233/ajchem.2013.13999
Abdul Aziz Ramadan
Department of Chemistry, Faculty of Sciences, Aleppo University, Aleppo, Syria
Hasna Mandil
Department of Chemistry, Faculty of Sciences, Aleppo University, Aleppo, Syria
Nour Ghazal
Department of Chemistry, Faculty of Sciences, Aleppo University, Aleppo, Syria

Corresponding Author(s) : Abdul Aziz Ramadan

dramadan@scs-net.org

Asian Journal of Chemistry, Vol. 25 No. 6 (2013): Vol 25 Issue 6

Abstract

Automatic biamperometric titration of copper (II) by iodide in non-aqueous media (methanol, ethanol, propanol, butanol and acetonitrile) was applied. In methanol no quantify acceptable curves appeared. In ethanol two end-points were observed, the first one according to the equation: 2Cu2+ + 4I– ® 2CuI¯ + I2 (I), while, the second-according to the following equation: I2 + I– ® I3– (II). In propanol and butanol two end-points were observed, the first one according to the equation: 2Cu2+ + 2I- ® 2Cu+ + I2 (III), the second-according to the following equation: Cu+ + I- ® CuI¯ (IV). Finally in acetonitrile two end-points were observed, the first one according to the equation (III) and the second according to the equation (II). The proposed method was successfully applied, for the first time, for the determination of 4 × 10-5 mol L-1 copper (II) with RSD not more than 4.2 %. The electrochemical reversibility of Cu2+/Cu+ and I2/I3– couples and irreversibility of Cu+/Cu is indicated by biamperometry. The behaviour of Cu2+, Cu+, CuI, I2 and I3– has been compared. A comparison with solvents has also been made.

Keywords

Biamperometric titration Copper(II) Iodide Acetonitrile
Aziz Ramadan, A., Mandil, H., & Ghazal, N. (2013). Automatic Biamperometric Titration of Copper(II) by Iodide in Some Non-Aqueous Media. Asian Journal of Chemistry, 25(6), 3452–3456. https://doi.org/10.14233/ajchem.2013.13999
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