Title: Use of partial molal enthalpy for refining the partition of water activity into electrostatic and nonelectrostatic components

Abstract

This paper describes a procedure to precisely decouple the electrostatic and the nonelectrostatic contributions to the water activity of an electrolyte solution, using the partial molal enthalpy of water in the electrolyte solution. This work is an extension of our previous work [Sahu et al. in Fluid Phase Equil. 460:57–68, 2018, Data in Brief 19:485–494, 2018], where a methodology to segregate the electrostatic and non-electrostatic contributions to the water activity was discussed and the constancy of the electrostatic contribution to the water activity was shown. However, in this paper, it is a noticeable point that even a 2% variation in the electrostatic contribution to the water activity leads to a very large deviation in the electrostatic contributions to the partial molal enthalpy of water. Therefore, due to the high sensitivity of the enthalpy to the variation of the water activity, the partial molal enthalpy of water is used for refinement of the method of partitioning the water activity into electrostatic and nonelectrostatic contributions and to provide the physical interpretation of the electrostatic and nonelectrostatic contribution to the partial molal enthalpy of water. This paper also describes the procedure to estimate the partial molal enthalpy of water from the water activity of the electrolyte solution. Microcalorimetry has been used to estimate the closed-spaced points of partial molal enthalpies.

Biography

Dr. Jyoti Sahu has earned his M.Tech.-PhD dual degree from Indian Institute of Technology, Bombay in Chemical Engineering with thermodynamics in electrochemistry in 2018. Prior to this, she has hold B.Tech.– Chemical Engineering from H.B.T.I. Kanpur, India. Following the completion of her Ph.D., she had done her postdoctoral from IIT Delhi, and IIT Kanpur. Her Ph.D. work is focused on the thermodynamic analysis of electrolytic systems with both experimental and theoretical components. Based on her research work, she has numerous publications and monographs in various renowned journals. Apart from this, she has various international conference proceedings papers also as a first author. Presently, Dr. Jyoti Sahu is working as an Assistant professor in the Department of Chemical Engineering in N.I.T. Tiruchirappalli, Tamil Nadu. Recently, she has been awarded “Best Young Woman Faculty Award 2021 - 2022” by Novel Research Academy. She has also been selected for InSc Young Researcher Award-2021.