Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model

Volkov, Alexander A.; Chuchupal, Sergey V.

doi:10.3390/ijms24065630

Open AccessArticle

Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model

by

Alexander A. Volkov

and

Sergey V. Chuchupal

^*

Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow 119991, Russia

^*

Author to whom correspondence should be addressed.

Int. J. Mol. Sci. 2023, 24(6), 5630; https://doi.org/10.3390/ijms24065630

Submission received: 31 January 2023 / Revised: 2 March 2023 / Accepted: 8 March 2023 / Published: 15 March 2023

(This article belongs to the Collection Feature Paper Collection in Biochemistry)

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Abstract

Thermodynamics of liquid water in terms of a non-standard approach—the ion–molecular model—is considered. Water is represented as a dense gas of neutral H₂O molecules and single charged H₃O⁺ and OH⁻ ions. The molecules and ions perform thermal collisional motion and interconvert due to ion exchange. The energy-rich process—vibrations of an ion in a hydration shell of molecular dipoles—well known to spectroscopists with its dielectric response at 180 cm⁻¹ (5 THz), is suggested to be key for water dynamics. Taking into account this ion–molecular oscillator, we compose an equation of state of liquid water to obtain analytical expressions for the isochores and heat capacity.

Keywords: liquid water; modeling; heat capacity; isochores; equation of state

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MDPI and ACS Style

Volkov, A.A.; Chuchupal, S.V. Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model. Int. J. Mol. Sci. 2023, 24, 5630. https://doi.org/10.3390/ijms24065630

AMA Style

Volkov AA, Chuchupal SV. Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model. International Journal of Molecular Sciences. 2023; 24(6):5630. https://doi.org/10.3390/ijms24065630

Chicago/Turabian Style

Volkov, Alexander A., and Sergey V. Chuchupal. 2023. "Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model" International Journal of Molecular Sciences 24, no. 6: 5630. https://doi.org/10.3390/ijms24065630

APA Style

Volkov, A. A., & Chuchupal, S. V. (2023). Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model. International Journal of Molecular Sciences, 24(6), 5630. https://doi.org/10.3390/ijms24065630

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model

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