Solvent Effect on the Thermodynamic Parameters of Ca(OH)2 by Conductivity Method

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

“…K). The ∆H° values were also in negative even in the presence of all these mixed solvent systems similar to the values reported in the literature [13,17]. Obviously it is due to the exothermic nature of calcium hydroxide.…”

“…In present study the average value of ∆S° was found -107.53 Jmol -1 K -1 in pure aqueous system while the reported values evaluated in pure water is -150 Jmol -1 K -1 and -171 ± 0.43 by simple titration method and conductometric method [13,17]. The significant decrease in the ∆S° values comparative to the reported value is due to the determination of ∆G° at slightly lower temperatures compared to the reported temperature (the present work ∆G° were obtained at 293 ± 1K and 343 ± 1K, while in reported work it was inferred at 298 ± 1K and 373 ± 1K and 277 ± 1K and 303 ± 1K [13,17]. The reason of selection of low temperature in the present work is due to the possibility of evaporation of mixed solvent systems that caused a significant decrease in ∆S° values.…”

“…The solvation of ion was possibly influenced by temperature in two ways. For instance it has been reported that ions-ions interaction is usually decreased by increasing temperature that results in the solvation of ions which enhances by rise in temperature [11,17,[19][20][21]. However, the solvation of ions may inversely be influenced by the rise in temperature, were a possible decrease in solvation occurs with the rise in temperature.…”

“…Entropy and Enthalpy values were also changed in mixed solvent systems. In previous work conductometric method was used for determination of thermodynamic parameters in mixed solvent systems [17]. But in present work pH metric method has been used.…”

<p><strong> Pengaruh perbandingan campuran pelarut air dan metanol terhadap pembentukan fasa, ukuran, dan stabilitas partikel kalsium karbonat untuk aplikasi biomedis</p></strong><em/><p><strong> Effect of the ratio of mixed water and methanol solvents on phase formation, size, and stability of calcium carbonate particles for biomedical applications</p></strong>

“…Increasing the amount of water is known to decrease the amount of vaterite produced. 13,14 Synthesis of CaCo3 using water and other alcohol solvents such as ethanol, propanol and isopropanol has been widely carried out. However, research on CaCo3 using water and methanol through the carbonation method is unknown.…”