Absolute determination of electrolytic conductivity for primary standard KCl solutions from 0 to 50�C

Wu, Yung‐Chi; Koch, William F.

doi:10.1007/bf00650765

Cited by 81 publications

(52 citation statements)

References 4 publications

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“…The specific conductance of this solution at various temperatures is available in the literature. (22) The corresponding cell constant values at T = (298.1, 308.1, 318.1 and 328.1) K are 0.834, 0.832, 0.829 and 0.820 cm −1 , respectively. In all experiments, the cell was thermostatted at the desired temperature ±0.1 K using an MLW thermostat.…”

Section: Methodsmentioning

confidence: 99%

Conductance study of the thermodynamics of micellization of 1-hexadecylpyridinium bromide in (water + cosolvent)

Jalali

Shamsipur

Alizadeh

2000

The Journal of Chemical Thermodynamics

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Section: Methodsmentioning

confidence: 99%

Conductance study of the thermodynamics of micellization of 1-hexadecylpyridinium bromide in (water + cosolvent)

Jalali

Shamsipur

Alizadeh

2000

The Journal of Chemical Thermodynamics

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“…Consistency of the metrological procedure used herein was demonstrated by repeating measurements for the previously recommended 0.01, 0.1, and 1.0 demal standards using the identical cells and equipment used for the molality-based primary standards [8,9]. These results are presented in Table 3, together with the primary standard values accepted by OIML [3] and recommended by IUPAC [4].…”

Section: Comparison Of the Present And Previous Standards And Measurementioning

confidence: 75%

“…Other experimental parameters (notably temperature, resistance, and amount of substance) affecting the final recommended value were determined with reference to the present fundamental units. Measurements of the previous demal-based standards of electrolytic conductivity were also performed using the same cells [6,8,9] in order to demonstrate agreement with the previous standards.…”

Section: Introductionmentioning

confidence: 99%

Molality-based primary standards of electrolytic conductivity (IUPAC Technical Report)

Pratt

Koch

et al. 2001

Pure and Applied Chemistry

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without theAbstract: New values of electrolytic conductivity were determined for aqueous KCl solutions with molalities of 0.01, 0.1, and 1.0 mol/kg in the temperature range 0 to 50 °C, at 5 K intervals. Expanded uncertainties, 2u c , were also calculated in accordance with the presently accepted protocol for the treatment of uncertainty. The new conductivity values are recommended as primary standards of electrolytic conductivity based on molality. They replace the previous values, based on the nonstandard demal scale, which were determined only at 0, 18, and 25°C. The accuracy of the technique used was evaluated by repeating the determination of the previously recommended demal-based IUPAC standards of electrolytic conductivity and through comparison with other absolute measurements.

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“…A dip-type conductivity cell with a cell constant of 0.59 cm -1 was used. The cell constant of the conductivity cell was determined by measuring the conductivity of aqueous potassium chloride solutions of different concentrations [27]. The titration was carried out in a thermostatically controlled water bath maintained at the desired temperature, with an accuracy of ± 0.01 o C. Shimadzu UV-1700 double beam spectrophotometer (Kyoto, Japan) with matched 10 mm quartz cells was used for spectrophotometric measurements.…”

Section: Instrumental Measurements and Conditionsmentioning

confidence: 99%

Conductometry, spectrophotometry and mass spectrometric investigation of Mg(II) and Ca(II) complexes with an antiretroviral drug, zidovudine

Shah¹,

Shah²,

Sanyal³

et al. 2018

Bull. Chem. Soc. Eth.

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ABSTRACT. Metal ions play a key role in living systems and are used to perform different physiological activities in our body. Complexation of drugs with metal ions is known to influence the bioavailability and other pharmacokinetic properties of drugs. In the present work, complexation of two essential cations, Mg 2+ and Ca 2+with zidovudine (AZT), the first approved antiretroviral drug for human immunodeficiency virus (HIV) has been studied by conductometry and spectrophotometry. The plots of molar conductance versus the mole ratio of], Job's method of continuous variation and mole ratio method showed the stoichiometry to be 1:1 (M 2+ :AZT) for both the cations. The metal ion-AZT complexes formed through the nitrogen of the azide group were further ascertained by liquid chromatography-mass spectrometric analysis. The formation constants of the complexes as evaluated by the conductance method and the Rose-Drago method were in good agreement. The values of thermodynamic parameters (∆H and ∆S) for the formation of complexes were obtained from the Van't Hoff plots. The results revealed that both the complexation reactions were spontaneous, endothermic and entropy stabilized.

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Absolute determination of electrolytic conductivity for primary standard KCl solutions from 0 to 50�C

Cited by 81 publications

References 4 publications

Conductance study of the thermodynamics of micellization of 1-hexadecylpyridinium bromide in (water + cosolvent)

Conductance study of the thermodynamics of micellization of 1-hexadecylpyridinium bromide in (water + cosolvent)

Molality-based primary standards of electrolytic conductivity (IUPAC Technical Report)

Conductometry, spectrophotometry and mass spectrometric investigation of Mg(II) and Ca(II) complexes with an antiretroviral drug, zidovudine

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