Mean activity coefficients at 25°C for NaBr−Ca(NO3)2−H2O mixtures,a ternary system without a common ion |
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| Authors: | A Haghtalab J H Vera |
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| Institution: | (1) Present address: Chemical Engineering Department, Tarbiat Modarres University, P. O. Box 14155-4838, Tehran, Iran;(2) Chemical Engineering Department, McGill University, H3A 2A7 Montreal, Que, Canada |
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| Abstract: | The mean ionic activity coefficients of NaBr in aqueous mixtures of NaBr and Ca(NO3)2 were determined at 25°C at a total ionic strenghth of 3, 4.5 and 6 molal. The measurements were made using an electrochemical cell with the ion-selective electrodes (ISE), Na-ISE against Br-ISE as a reference electrode. The experimental mean activity coefficients of NaBr obey Harned's Rule. The mean activity coefficients of Ca(NO3)2 were calculated using the cross differentiation of the mean activity coefficients. |
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| Keywords: | Mean activity coefficient sodium bromide + calcium nitrate ion-selective electrodes emf |
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