Conductometric study of Lactic acid in the aqueous solutions of poly(ethylene glycol) + ionic liquid
کد مقاله : 1191-PHYSCHEM20
1Abbas Mehrdad *، 2حمایت شکاری، 1Narmin Noorani
1Tabriz University
2دانشگاه تبریز
چکیده مقاله:
In this research, influence of some ionic liquids on the electrical conductivity of L(+)-lactic acid (LaH) have been investigated in aqueous poly(ethylene glycol) (PEG) solutions. The molar conductivities of LaH in aqueous solutions of (PEG + ionic liquid, 1-hexyl-3-methylimidazolium bromide [HMIm]Br /1-octyl-3-methylimidazolium bromide[OMIm]Br) were measured at T = (288.15-318.15) K. These data have been analyzed by Quint-Viallard (QV) conductivity equation and the limiting molar conductivities (Λ0) and dissociation constants ( ) were calculated by this equation. The results demonstrate that the values of Λ0 decrease with increasing concentration and longer alkyl chain length of the ionic liquids. The values were also used to calculate the dissociation standard thermodynamic functions ( , , and ). The values of are positive and become more positive at higher temperatures.
کلیدواژه ها:
Lactic acid; Poly(ethyleneglycol); Quint-Viallard (QV)conductivity equation; Ionic liquid; Molar conductivity.
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