盐酸在40Wt%DMSO—H_2O混合溶剂中热力学性质的研究

STUDIES ON THERMODYNAMIC PROPERTIES OF HYDROCHLORIDE ACID IN 40wt%DMSO—H_2O MIXED SOLVENTS

本文用emf法通过测定得到Pt,H_2(latm)Hcl(xm)+H_2O|AgCl—Ag及Pt,H_2(latm)I HCl(xm)+40Wt%DMSO+H_2O/AgCl—Ag两电池的标准电动势E°及其温度系数。求出盐酸从H_2O到40Wt%DMSO—H_2O混合溶剂的迁移自由能ΔGtr、迁移焓ΔHtr、迁移熵ΔStr及迁移活度系数~wγ~s。进而求出盐酸在40Wt%DMS0—H_2O混合溶剂中的标准生成自由能ΔfG°(298.15)。

Electromotive force measurements of cells Pt,H_2(latm)|HCl(xm)+H_2O|AgCl—Ag and Pt,H_2(latm)|HCl(xm)+40Wt%DMSO—H_2O|AgCl—Ag atthree temperatures ranging from 25 to 45℃,were used to derive thestandard emf of the cells and temperature coeficients of emf.Wehave calculated the transfer free energies,transfer enthalpies and transferssactivity coeficients of HCl form water to 40Wt%DMSO—H_2O mixed solventcalculated and the standard formation free energy Δ_fG°(298.15)of HClmixed solvents.