Studies on Potentiometric Titration System of Precipitation of Aluminium-Fluoride in Ethanol-Water Midium

Abstract

Abstract: The present paper covers the chemical equilibriums of precipitation of aluminium with fluoride in ethanol-water midium.The successive stability constants for aluminium-fluoride were determined in the complexation domain of the titration curve.The solubility product of the precipitation of Na_{3AlF₆ was calculated in precipitation domain of the titration curve.The effect of pH on the equilibrium was theoretically investigated.The additional proton constants of fluoride ion were determined in water and ethanol midium with different concentrations.The values are found to be in fair agreement with literature data.The titration system was tested by standard recovery and standard sample analysis.Recovery ratio is 100±0.6%.The relative errors for standard sample analysis are less than 1%.It is shown that the system for aluminium-fluoride potentiometric titration is valid.}

Key words: Aluminium, Fluoride ion selective electrode, Solution equilibria, Potentiometric titration

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LI Xi-chun, ZENG Bin-li . Studies on Potentiometric Titration System of Precipitation of Aluminium-Fluoride in Ethanol-Water Midium[J]. Chem. J. Chinese Universities, 1992, 13(6): 756.

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Studies on Potentiometric Titration System of Precipitation of Aluminium-Fluoride in Ethanol-Water Midium

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