Review of Study of ion-solvent interaction during determination of deprotonation constant of glycine in 10, 20 and 30% dioxane (m/m) in the dioxane-water system at 288.15K, 298.15K, 308.15K and 318.15K potentiometrically

Authors

  • Md. Shamsuddin  Maharana Pratap Govt. P.G. College, Chittorgarh, Rajasthan, India

Keywords:

Ion-Solvent Interaction, Free Energy Change, Dielectric Constant, Modified Davies Equation, Acidic Dissociation Constant

Abstract

To study ion-solvent interaction in the system, free energy transfer(ΔGt) was calculated by determining acidic dissociation of Glycine1-4 in 10, 20 and 30% dioxane content in dioxane-water system at 288.15K, 298.15K, 308.15K and 318.15K have been studied by measuring e.m.f of the cell:

H2(Pt) | Glycine, HCl, X% Dioxane(100-X)% water, Hg2Cl2 | Hg m1 m2 (C-1)

in 10, 20 and 30% dioxane in dioxane-water system at 288.15K to 318.1K at an interval of 10K and e.m.f. of the cell was give by:

E = E0 - (2.303RT/F) (log mH+ mCl_ + log ?H+ ?Cl_) (1)

where log ?H+ ?Cl_ = - (2A`√μ/(1+√μ) ) + b1μ (2) 

log K1 - ?1μ = log K1(A) – (2A`√μ/(1+√μ) ) (3)

The equation (2) is called Modified Davies equation given by B.Prasad5 for calculating activity coefficient in the system.

From equation (3), acidic dissociation constant of glycine were calculated by extrapolating the graph at μ=0 in 10, 20 and 30% dioxane in dioxane-water system from 288.15K to 318.5K at an interval of 10K and then free energy transfer was calculated by the formula:

ΔGt = 2.30259 RTΔpK1 …(4)

Where ΔpK1 = pKs - pKw

S – stand for mean mix solvent

W – stand for water

Keyword: Ion-Solvent Interaction, Free Energy Change, Dielectric Constant, Modified Davies Equation, Acidic Dissociation Constant

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International Journal of Scientific Research in Chemistry

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Published

2023-10-22

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Volume 8, Issue 5, September-October-2023

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Research Articles

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[1]
Md. Shamsuddin, " Review of Study of ion-solvent interaction during determination of deprotonation constant of glycine in 10, 20 and 30% dioxane (m/m) in the dioxane-water system at 288.15K, 298.15K, 308.15K and 318.15K potentiometrically, International Journal of Scientific Research in Chemistry(IJSRCH), ISSN : 2456-8457, Volume 8, Issue 5, pp.11-16, September-October-2023.