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Dissociation and microsolvation of bisulfate anion
Author(s) -
Ashraf Hamad,
Hua Cheng,
Zhang YunHong
Publication year - 2020
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5845
Subject(s) - dissociation (chemistry) , chemistry , ion , raman spectroscopy , sulfate , molecule , supersaturation , aqueous solution , inorganic chemistry , organic chemistry , physics , optics
Abstract Bisulfate anion has vast applications in industrial and environmental chemistry. Its dissociation to sulfate anion has been studied computationally and by size‐selected clusters. In this study, Micro‐Raman spectroscopy is applied at different relative humidity (RH)% on small droplets of aqueous solutions of NaHSO 4 , NH 4 HSO 4 , and H 2 SO 4 to explore the dissociation of HSO 4 ‐ experimentally in bulk and supersaturated state. Our cumulative experimental results support the conclusion obtained from gas‐phase cluster study that HSO 4 ‐ starts dissociating at very low number of water molecules (H 2 O ~ 1). However, dissociation of HSO 4 ‐ is found dependent on the cation attached with this weak acid. The magnitude of dissociation is found as NH 4 HSO 4 ≈ H 2 SO 4 > NaHSO 4 . In addition, studying the hydration process of HSO 4 − in the presence of three different cations enabled us to observe various species in three systems. Theoretical values obtained from extended aerosol inorganic model supports the experimental results.