RESEARCH ARTICLE - AstonJournals

Chemical Sciences Journal, Vol. 2013: CSJ-1061Study of the Thermodynamic Parameters by the Dissolutionof Barium Hydroxide in Water through Conductivity MethodSyed A Ali 1* , Muhammad Z Iqbal 2 , Atya Hassan 31Department of Chemistry, University of Karachi, Karachi, Sindh, Pakistan.2Department of Chemistry, Government Degree Science College, Malir Colony,Karachi, Sindh, Pakistan.3Department of Chemistry, Federal Urdu University of Arts, Science and Technology,Karachi, Sindh, Pakistan.*Correspondence: aliazhar325@yahoo.comAccepted: May 9, 2013; Published: June 12, 2013AbstractThe dissolution of Barium hydroxide (Ba(OH) 2) in pure water was used for finding out its thermodynamic parameters byconductivity method. The effect of ionic salts as well as the influence of some mixed solvent (1,2-propanediol and ethanol) werealso studied. It was found that the added ionic salts produced fewer changes in the thermodynamic parameters compared tomixed solvents. Moreover, the combined salts and mixed solvent system collectively changed the thermodynamic parameters moredifferently as compared to the separate systems. These results were compared with the dielectric constant and ionic strengthof the media.Keywords: Barium hydroxide; thermodynamic parameters; conductivity; mixed solvent; dielectric constant.1. IntroductionBarium hydroxide (Ba(OH) 2) is very important due to its industrial applications in different fields. It is used as anadditive in thermoplastic, phenolic resins and PVC stabilizers to improve plastic properties. It is also used as generalpurpose additive for lubricant and grease. It is used in sugar industry, soap manufacturing, fat saponification, fusingof silicates and chemical synthesis of other Ba(OH) 2compounds. The significant role of Ba(OH) 2is also reported inphotographic papers and printing process. It is used in the synthesis of many Chalcones [1, 2]. In synthetic organicchemistry, it is also used for hydrolysis of ester [3, 4] and nitriles [5–7] in preparation of cyclopentanone [8, 9] and indiacetone alcohol [10] etc. Similarly, it is used in the study of endothermic reaction when mixed with ammonium salts.The sparingly soluble salts when dissolved in water dissociate rarely and their degree of dissociation is controlled byvarious factors like temperature, pH and dielectric constant etc. In case of change in temperature, effect related tothe dissociation of Ba(OH) 2follows by the following equation:AstonJournalsBa(OH) 2« Ba 12 1 2OH 2The concentration of OH 2 is determined by titrating it with standard HCl solution. The molar solubility “S”of Ba(OH) 2is determined from following equations,Ba 12 (aq) 1 2OH2 (aq) 1 2H 3 O1 (aq) 1 2Cl2 (aq) « Ba12 (aq) 1 2Cl2 (aq) 1 4H 2 OMoles of hydroxide 5 Moles of HCl 5 Liters of HCl 3 [HCl]Moles of Ba(OH) 25 ½ moles of OH 2 where,S 5 Moles of Ba(OH) 2in aliquot/volume of aliquot in liters(1)Co-Publisher: OMICS Group, www.omicsonline.orghttp://astonjournals.com/csj