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Ionic association and thermodynamic functions for solvation interaction of nano copper sulfate (NCS) with methyl red (MR) in mixed methanol (MeOH) –Water solvents

Article

Last updated: 28 Dec 2024

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Chemistry

Abstract

Specific conductivities for nano copper sulfate (NCS) have been  measured in binary mixed solvent-solvent with methyl alcohol (MeOH) mass fraction 0%, 20% and 40% (W/W) (MeOH-H2O) at different temperatures: 298.15, 303.15 ,308.15 and 313.15 K (with a step of 5 K) and in the presence of methyl red indicator (MR) as chelating agent. The experimental data have been analyzed by the use of Fuoss-Shedlovsky conductivity model (FSH) equation.  Molar conductance (Λm), limiting molar conductance (Λ0) , Walden product (Λ0 η0), ion-pair association constant (KA) and the standard thermodynamic parameters for the association (ΔG°A, ΔH°A and ΔS°A) were estimated and discussed in absence and in presence of methyl red (MR). All the thermodynamic parameters were evaluated for the interaction of nano copper sulfate (NCS) with methyl red (MR).The ion pair association constant (KA) and the different thermodynamic functions were increased by increasing the percentage of methanol by molar mass and increase of temperature favoring more ion - solvent interactions  between nano copper sulfate (NCS) and methyl red (MR). The effect of formation of hydrogen bond (FHB) in solution also has been studied. The obtained results show that the association constant (KA) was increased as the relative bulk permittivity of the solvent decreased while the molar conductance (Λm) and the limiting molar conductivities (Λ0) were decreased. Furthermore, as the temperature increased, the association constant (KA) values were increased indicating the association process is endothermic.

DOI

10.21608/aunj.2017.221422

Keywords

Molar conductance (Λm), ion-pair association constant (KA), Binary mixed solvents. Permittivity of the solvent, Thermodynamic parameters, Fuoss-Shedlovsky model (FSH), Methyl red (MR)

Volume

46

Article Issue

2

Related Issue

31578

Issue Date

2017-12-01

Receive Date

2022-02-23

Publish Date

2017-12-01

Page Start

46

Page End

57

Print ISSN

2812-5029

Online ISSN

2812-5037

Article File

AUNJ_Volume 46_Issue 2_Pages 46-57.pdf

PDF . 698.1kB

Link

https://aunj.journals.ekb.eg/article_221422.html

Detail API

https://aunj.journals.ekb.eg/service?article_code=221422

Order

221,422

Type

Novel Research Articles

Type Code

2,242

Publication Type

Journal

Publication Title

Assiut University Journal of Multidisciplinary Scientific Research

Publication Link

https://aunj.journals.ekb.eg/

MainTitle

Ionic association and thermodynamic functions for solvation interaction of nano copper sulfate (NCS) with methyl red (MR) in mixed methanol (MeOH) –Water solvents

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Type

Article

Created At

23 Jan 2023