Aqueous solutions of tris(1,2-diaminoethane)cobalt(III) chloride and tris(1,3-diaminopropane)cobalt(III) chloride atT = 278.15 K. Enthalpy of dilution |
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| Institution: | 1. Department of Mechanical Engineering, Motilal Nehru National Institute of Technology, Allahabad, Prayagraj, Uttar Pradesh, India;2. Department of Chemical Engineering, Motilal Nehru National Institute of Technology, Allahabad, Prayagraj, Uttar Pradesh, India;3. Natural Composite Research Group, Department of Materials and Production Engineering, The Sirindhorn International Thai–German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand |
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| Abstract: | The enthalpies of dilution of aqueous solutions of {Co(en)3}Cl3and {Co(tn)3}Cl3(where en = 1,2-diaminoethane andtn = 1,3-diaminopropane) have been measured up to m = 1 mol · kg ? 1at T = 278.15 K and atmospheric pressure with an isoperibol calorimeter by the long-jump method. Relative apparent molar enthalpies Lφ,mhave been extracted from an empirical polynomial of the molality square root. Previously reported data at T = 298.15 K are compared with the new experimental dilution results. A noticeable decrease in Lφ,mwas observed at every experimental concentration when temperature diminished from 298.15 K to 278.15 K. An inversion in the relative layout for the Lφ,mcurves of aqueous {Co(en)3}Cl3and {Co(tn)3}Cl3was also found. |
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