Dissociation Constant of Proline in 10, 20 and 30% Dioxane in Dioxane-Water at 288.15K and Related Thermodynamic Quantities by e.m.f. Measurement

Author:

Md. Shamsuddin 1,A. K. Ghosh 2

Affiliation:

1. Maharana Pratap Govt. P.G. College, Chittorgarh, Rajasthan, India

2. Ex Head of The Department of Chemistry, Patna University, Science College, Patna, Bihar, India

Abstract

<p>Dissociation constant of Proline was determined by potentiometric method using following type of cell:</p> <p>H2(Pt) | Proline, HCl, X% Dioxane, Hg2Cl2 | Hg ...(C-1)</p> <p>m1 m2(100-x)%water</p> <p>and emf of the cell is given by:</p> <p>E = E0 − (2.303RT/F) (log mH+ mCl_ + log ƔH+ ƔCl−) ...(1)</p> <p>where</p> <p>log ƔH+ ƔCl_ = -(2A`√μ/(1+√μ) )+ β1μ (Modified Davies Equation) ...(2)</p> <p>The equation (2) is Modified Davies Equation which is used for calculating activity coefficient in a system and which is measure of deviation from ideality of solution. Hence, taking into account activity coefficient, acidic dissociation constant of Proline can be calculated by calculating mH+ given by the formula:</p> <p>log mH+ = (E0 − E)/K − log mCl_ + (2A’ √μ/(1+ √μ)) − β1μ ...(3)</p> <p>and hence acidic dissociation constant of Proline is given by:</p> <p>logK1 − β1μ = logK1(A) − (2A`√μ) / (1 + √μ) and hence by calculating acidic dissociation constant of Proline, thermodynamic quantities ΔG0 , ΔH0 and ΔS0 can be calculated.</p>

Publisher

Technoscience Academy

Subject

Cardiology and Cardiovascular Medicine

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