Review of effect of temperature and thermodynamic quantities upon acidic dissociation of Glycine in 10, 20 and 30% dioxane (m/m) in dioxane-water system at 288.15K, 298.15K, 308.15K and 318.15K by e.m.f. measurement

Authors

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

DOI:

https://doi.org/10.32628/IJSRST52310596

Keywords:

Thermodynamic Quantity, Acidic Dissociation Constant, Modified Davies Equation, Least Square Method.

Abstract

For study of effect of temperature and thermodynamic quantities upon acidic dissociation of Glycine in 10, 20, and 30% dioxane(m/m) content in dioxane-water system at 288.15K, 298.15K, 308.15K, and 318.15K, the following types of cell has been set up:

H2(Pt) | Glycine, HCl, X% Dioxane, Hg2Cl2 | Hg

m1 m2 (C-1)

in 10, 20, and 30% dioxane in dioxane-water system at 288.15K to 318.15K at an interval of 10K, and e.m.f. of the cell was given by:

E = E0 - (2.303RT/F) (log mH+ mCl_ + log ƔH+ ƔCl_) (1)

where,

log ƔH+ ƔCl_ = - (2A`√μ/(1+√μ) ) + b1μ (2) 

log K1 - b1μ = log K1(A) – (2A`√μ/(1+√μ)) (3)

The equation (2) is called Modified Davies equation given by B. Prasad1 for calculating activity coefficient in the system.

From equation (3), acidic dissociation constant of glycine was calculated2-5 by extrapolating the graph at μ=0 in 10, 20, and 30% dioxane (m/m) in dioxane-water system from 288.15K to 318.5K at an interval of 10K, and then standard free energy change, standard enthalpy change, and standard entropy change were calculated by thermodynamic relations:

 ΔG0 = -RTlnK1 (4)

and ΔG0 = ΔH0 - TΔS0 (5)

and by least square method6.

References

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  6. H. S. Harned and R. A. Robinson, Trans. Farad. Soc., 1940, 36, 973-978.
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  15. H. S. Harned and R. S. Done, J. Am. Chem. Soc., 1941, 63(10), 2579-2582.
  16. J. T. Edsall and R. D. Blanchard, J. Am. Chem. Soc., 1933, 55(6), 2337-2353.
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International Journal of Scientific Research in Science and Technology

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Published

2023-10-30

Issue

Volume 10, Issue 5, September-October-2023

Section

Research Articles

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How to Cite

[1]
Md. Shamsuddin "Review of effect of temperature and thermodynamic quantities upon acidic dissociation of Glycine in 10, 20 and 30% dioxane (m/m) in dioxane-water system at 288.15K, 298.15K, 308.15K and 318.15K by e.m.f. measurement" International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011,Volume 10, Issue 5, pp.605-611, September-October-2023. Available at doi : https://doi.org/10.32628/IJSRST52310596