Dissociation and microsolvation of bisulfate anion

Hamad Ashraf; Cheng Hua; Yun Hong Zhang

doi:10.1002/jrs.5845

Dissociation and microsolvation of bisulfate anion

Hamad Ashraf, Cheng Hua, Yun Hong Zhang^*

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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 NaHSO₄, NH₄HSO₄, and H₂SO₄ to explore the dissociation of HSO₄ ^- experimentally in bulk and supersaturated state. Our cumulative experimental results support the conclusion obtained from gas-phase cluster study that HSO₄ ^- starts dissociating at very low number of water molecules (H₂O ~ 1). However, dissociation of HSO₄ ^- is found dependent on the cation attached with this weak acid. The magnitude of dissociation is found as NH₄HSO₄ ≈ H₂SO₄ > NaHSO₄. In addition, studying the hydration process of HSO₄ ⁻ 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.

Original language	English
Pages (from-to)	829-837
Number of pages	9
Journal	Journal of Raman Spectroscopy
Volume	51
Issue number	5
DOIs	https://doi.org/10.1002/jrs.5845
Publication status	Published - 1 May 2020

Keywords

E-AIM
Raman spectroscopy
dissociation

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10.1002/jrs.5845

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title = "Dissociation and microsolvation of bisulfate anion",

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 NaHSO4, NH4HSO4, and H2SO4 to explore the dissociation of HSO4 - experimentally in bulk and supersaturated state. Our cumulative experimental results support the conclusion obtained from gas-phase cluster study that HSO4 - starts dissociating at very low number of water molecules (H2O ~ 1). However, dissociation of HSO4 - is found dependent on the cation attached with this weak acid. The magnitude of dissociation is found as NH4HSO4 ≈ H2SO4 > NaHSO4. In addition, studying the hydration process of HSO4 − 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.",

keywords = "E-AIM, Raman spectroscopy, dissociation",

author = "Hamad Ashraf and Cheng Hua and Zhang, {Yun Hong}",

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year = "2020",

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doi = "10.1002/jrs.5845",

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TY - JOUR

T1 - Dissociation and microsolvation of bisulfate anion

AU - Ashraf, Hamad

AU - Hua, Cheng

AU - Zhang, Yun Hong

PY - 2020/5/1

Y1 - 2020/5/1

N2 - 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 NaHSO4, NH4HSO4, and H2SO4 to explore the dissociation of HSO4 - experimentally in bulk and supersaturated state. Our cumulative experimental results support the conclusion obtained from gas-phase cluster study that HSO4 - starts dissociating at very low number of water molecules (H2O ~ 1). However, dissociation of HSO4 - is found dependent on the cation attached with this weak acid. The magnitude of dissociation is found as NH4HSO4 ≈ H2SO4 > NaHSO4. In addition, studying the hydration process of HSO4 − 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.

AB - 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 NaHSO4, NH4HSO4, and H2SO4 to explore the dissociation of HSO4 - experimentally in bulk and supersaturated state. Our cumulative experimental results support the conclusion obtained from gas-phase cluster study that HSO4 - starts dissociating at very low number of water molecules (H2O ~ 1). However, dissociation of HSO4 - is found dependent on the cation attached with this weak acid. The magnitude of dissociation is found as NH4HSO4 ≈ H2SO4 > NaHSO4. In addition, studying the hydration process of HSO4 − 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.

KW - E-AIM

KW - Raman spectroscopy

KW - dissociation

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Dissociation and microsolvation of bisulfate anion

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Keywords

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