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7544

CONDUCTOMETRIC INVESTIGATION OF MAGNESIUM (II), CALCIUM (II) AND BARIUM (II) COMPLEXES IN AQUEOUS SOLUTION

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Last updated: 22 Jan 2023

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Chemistry

Abstract

The ionic association constants, KA, of Mg, Ca and Ba metal ions with succinate, malate and tartrate ligands were conductometrically determined in water at 25–40oC. The conductometric data were analysed by the Shedlovsky extrapolation method. The KA values tend to decrease with the cation size in the order Ca > Ba for all the salts under study with the exception of Mg salts, whereas the KA values for the ligands increase in the order succinate < malate < tartrate. For the salts under study, standard thermodynamic functions, Ho and So for the association were evaluated and discussed. The positive values of both Ho and So in all the systems indicate the ionic association processes are the reactions of unfavorable enthalpy and favorable entropy changes in aqueous solution. The thermodynamic metal gradient, , was evaluated and its significance of ion association of all salts under investigation was discussed. On the other hand, the results of limiting molar conductance, o, are discussed on the light of Walden product.

DOI

10.21608/absb.2009.7544

Keywords

Conductivity, Association constant, alkaline–earth metal, succinate, malate, tartrate, aqueous solution

Authors

First Name

ABD ALLAH

Last Name

MOHAMED

MiddleName

A.

Affiliation

Chemistry Department, Faculty of Science, Al–Azhar University, Nasr City, Cairo, Egypt

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First Name

WADIE

Last Name

AL–ARIQUI

MiddleName

S.

Affiliation

Chemistry Department, Faculty of Science, Sana'a University, Sana'a, Republic of Yemen.

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City

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Orcid

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First Name

MOUSTAFA

Last Name

BAKR

MiddleName

F.

Affiliation

Chemistry Department, Faculty of Science, Al–Azhar University, Nasr City, Cairo, Egypt

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City

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Orcid

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Volume

20

Article Issue

Issue 1-A

Related Issue

1450

Issue Date

2009-06-01

Receive Date

2009-01-09

Publish Date

2009-06-01

Page Start

61

Page End

70

Print ISSN

1110-2535

Online ISSN

2636-3305

Article File

ABSB_Volume 20_Issue Issue 1-A_Pages 61-70.pdf

PDF . 138.1kB

Link

https://absb.journals.ekb.eg/article_7544.html

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https://absb.journals.ekb.eg/service?article_code=7544

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6

Type

Original Article

Type Code

520

Publication Type

Journal

Publication Title

Al-Azhar Bulletin of Science

Publication Link

https://absb.journals.ekb.eg/

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Article

Created At

22 Jan 2023