Raman spectroscopy and atomic force microscopy of the reaction of sulfuric acid with sodium chloride

C. D. Zangmeister, Jeanne E Pemberton

Research output: Contribution to journalArticle

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Abstract

The reaction of NaCl with H2SO4 is investigated using Raman spectroscopy, atomic force microscopy (AFM), and gravimetric analysis. Raman spectra are consistent with the formation of NaHSO4 with no evidence for Na2SO4. The spectra indicate that the phase of NaHSO4 varies with the amount of H2O in the H2SO4. At low H2O concentrations, the reaction produces anhydrous β-NaHSO4, which undergoes a phase change to anhydrous α-NaHSO4 over the course of 18 h. At higher H2O concentrations, anhydrous α-NaHSO4 is formed with small amounts of NaHSO4·H2O. AFM measurements on NaCl (100) show the formation of two distinct types of NaHSO4 structures consistent in shape with α-NaHSO4 and β-NaHSO4. The β-NaHSO4 structures are mobile and move along the NaCl (110) plane until they encounter existing stationary α-NaHSO4 structures whereupon the two forms coalescence to form larger α-NaHSO4 structures. Gravimetry was used to determine the amount of HCl evolved upon exposure to aqueous H2SO4 solutions modeling atmospheric aerosols. At low H2SO4 concentrations, a large percentage of the HCl formed remains dissolved in the H2O. These results indicate that for conditions simulating relative humidities above 40%, the fraction of HCl released from this reaction may be as low as 0.40 ± 0.11.

Original languageEnglish (US)
Pages (from-to)12289-12296
Number of pages8
JournalJournal of the American Chemical Society
Volume122
Issue number49
DOIs
StatePublished - Dec 13 2000

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Raman Spectrum Analysis
Gravimetric analysis
Atomic Force Microscopy
Sodium chloride
Sulfuric acid
Sodium Chloride
Raman spectroscopy
Atomic force microscopy
Atmospheric aerosols
Humidity
Aerosols
Coalescence
Raman scattering
Atmospheric humidity
sulfuric acid

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Raman spectroscopy and atomic force microscopy of the reaction of sulfuric acid with sodium chloride. / Zangmeister, C. D.; Pemberton, Jeanne E.

In: Journal of the American Chemical Society, Vol. 122, No. 49, 13.12.2000, p. 12289-12296.

Research output: Contribution to journalArticle

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abstract = "The reaction of NaCl with H2SO4 is investigated using Raman spectroscopy, atomic force microscopy (AFM), and gravimetric analysis. Raman spectra are consistent with the formation of NaHSO4 with no evidence for Na2SO4. The spectra indicate that the phase of NaHSO4 varies with the amount of H2O in the H2SO4. At low H2O concentrations, the reaction produces anhydrous β-NaHSO4, which undergoes a phase change to anhydrous α-NaHSO4 over the course of 18 h. At higher H2O concentrations, anhydrous α-NaHSO4 is formed with small amounts of NaHSO4·H2O. AFM measurements on NaCl (100) show the formation of two distinct types of NaHSO4 structures consistent in shape with α-NaHSO4 and β-NaHSO4. The β-NaHSO4 structures are mobile and move along the NaCl (110) plane until they encounter existing stationary α-NaHSO4 structures whereupon the two forms coalescence to form larger α-NaHSO4 structures. Gravimetry was used to determine the amount of HCl evolved upon exposure to aqueous H2SO4 solutions modeling atmospheric aerosols. At low H2SO4 concentrations, a large percentage of the HCl formed remains dissolved in the H2O. These results indicate that for conditions simulating relative humidities above 40{\%}, the fraction of HCl released from this reaction may be as low as 0.40 ± 0.11.",
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