Determination of the solubility of 6-Chloro-7-azapurine in twelve single solvents and four binary mixed solvent systems at T= (278.15–323.15) K

2021 ◽  
pp. 106493
Author(s):  
Guoxing Hu ◽  
Hanhan Xu ◽  
Wenge Yang ◽  
Aixiang Hao ◽  
Wei Sun ◽  
...  
Keyword(s):  
Mixed Solvent ◽  
Solvent Systems

Determination of Thermodynamic Parameters from the Dissolution of Strontium Hydroxide in Water and Mixed Solvent Systems by pH-Metric Method

2020 ◽  
Vol 42 (1) ◽  
pp. 57-57
Author(s):  
Shamsher Ali Shamsher Ali ◽  
Shabir Hussain Shabir Hussain ◽  
Irfan Ali and Syed Azhar Ali Irfan Ali and Syed Azhar Ali
Keyword(s):  
Mixed Solvent ◽  
Pure Water ◽  
Mixed Solvents ◽  
Entropy Change ◽  
Titration Data ◽  
Strontium Hydroxide ◽  
Two Temperatures ◽  
Solvent Systems ◽  
Molar Solubility

In this study, saturated solutions of Sr(OH)2 in pure water and in mixed solvent systems (methanol - water, ethanol - water, 1-propanol - water, and 2-propanol - water) at two temperatures were prepared and titrated with standard HCl solution by using pH metry. Using these titration data, the molar solubility (s), solubilty product (Ksp) and Gibbs free energy (Go), entropy change (ΔSand#176;) and enthalpy change (ΔHand#176;) for dissolution of strontium hydroxide was determined. At room temperature (20and#176;C), the s, Ksp, ∆Go were found to be 4.28 x 10-2 mol L-1, 3.13 x 10-4 mol3L-3 and 19.70 kJ mol-1 respectively. The ΔHand#176; and ΔSand#176; of the reaction is 2.90 kJ mol-1 and – 60.80 J. mol-1 K-1. With increasing percentage content of organic solvent in mixed solvents, the molar solubility and Ksp decreased and ∆Go, ΔHand#176; and ΔSand#176; values increased. The results were correlated with the dielectric constant value of the solvents used in the study.

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