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Citation: Zhao Kaiyuan, Zhang Hongli. THE INFLUENCE OF NH₄⁺-ION ON UNSYMMETRICAL POTENTIAL OF GLASS-ELECTRODE[J]. Chinese Journal of Applied Chemistry, ;1992, 9(4): 46-51. shu

THE INFLUENCE OF NH₄⁺-ION ON UNSYMMETRICAL POTENTIAL OF GLASS-ELECTRODE

Zhao Kaiyuan ^, ,
Zhang Hongli

1.
Department of Chemistry, Suzhou Railway Teachers College Suzhou 215009

Corresponding author: Zhao Kaiyuan,
Received Date: 25 February 1991
Available Online: 19 November 1991

The electromotive forces of the following cells 1. Ag|AgCl|HCl(m_A)+NH₄Cl(m_B)+H₂O|Glass-eleetrode2. Pt(black)|H₂(latm)|HCl(m_A)+NH₄Cl(m_B)+H₂O|AgCl|Agg have been measured at total molalities of 0.1, 0.5, 1.0, 2.0 and 3.0 mol.kg^-1 at 25℃. The potential of the glass-eteetrode was found not to be in agrtement with Nernst equation due to the effect from NH₄⁺.The unsymmetrical potential of the glass-electrode have been derived:ε_G°=ε_G°'+(RT/F)ln[1+Kα(1+βy_B)y_B/(1-y_B)] where y_B is malar fraction of NH₄Cl,ε_G°' is unsymmetrical potential of glass-electrode at y_B=0. K is an equilibrium constant for ion-exchange, α and β are experimental parameters.
- glass-electrode,
- unsymmetrical potential,
- ammonium ion
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THE INFLUENCE OF NH₄⁺-ION ON UNSYMMETRICAL POTENTIAL OF GLASS-ELECTRODE