Gas-Phase Acidities of Nine Sulfur Oxoacids of Composition [H2,S,On] (n = 1–4)

Otto, André; Steudel, Ralf

doi:10.1002/(sici)1099-0682(200004)2000:4<617::aid-ejic617>3.0.co;2-z

Cited by 17 publications

(4 citation statements)

References 54 publications

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“…The equations for the reaction of the sulfite anion with water included the formation of sulfurous acid (50%), a hydrogen sulfite anion (24%), sulfur dioxide SO 2 (19%), and -. When considering these products, it should be noted that sulfurous acid is unstable and decomposes into H 2 O and SO 2 (Otto & Steudel, 2000;Voegele, Tautermann, Rauch, Loerting, & Liedl, 2004). This fact was used by students who wrote sulfur dioxide as the product in the form of SO 2 or .…”

Section: Discussionmentioning

confidence: 99%

“…However, this notation is, strictly speaking, incorrect. It is used to demonstrate that two tautomeric forms of sulfurous acid are present in an aqueous solution, H-S(=O) 2 OH and SO(OH) 2 , as well as their ions, HSO 3 and SO 2 OH -, respectively (Otto & Steudel, 2000;Steudel & Steudel, 2009). However, the existence and stability of these molecules are not considered at the upper-secondary-school level, so this was most certainly not the students' intention.…”

Section: Discussionmentioning

confidence: 99%

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Alternative Conceptions of Common Salt Hydrolysis Among Upper-Secondary-School Students

Orwat

Bernard

Migdał-Mikuli

2017

JBSE

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Reactions in aqueous solutions are an important part of chemistry education. As experience shows, they are particularly difficult for students to understand. Hydrolysis is one such reaction. It occurs in organic and inorganic compounds with either covalent and ionic structures, but salt hydrolysis is a special example. Salt hydrolysis is complex, and to understand it, students must consider the reaction equilibrium, dissociation process, and acid-base properties of reactants and products. Additionally, in the upper-secondary-school curriculum, hydrolysis is described only qualitatively, which can lead students to misinterpret hydrolysis and solution equilibrium. In this study, 235 upper-secondary-school students answered questions about the acidity of common salt solutions and tried to justify their responses by writing appropriate chemical equations. An analysis of the answers revealed the students’ alternative conceptions and misconceptions. The character of the misconceptions showed that they are school-based and largely caused by excessive simplification of the process as well as the usage of inappropriate analogies. Key words: salt hydrolysis, acids and bases, alternative and misconceptions, chemical education research.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Alternative Conceptions of Common Salt Hydrolysis Among Upper-Secondary-School Students

Orwat

Bernard

Migdał-Mikuli

2017

JBSE

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“…Owing to the strong c-type spectrum for the C s isomer, many more lines have been detected compared to the C 2 isomer. In total, 23 rotational transitions were measured (Table 4); of the observed transitions, 13 were measured with FTM spectroscopy, and the other 10 were measured with DR. The total rms of the deviations between fitted frequencies and measured frequencies is 6.9 kHz, but this number cannot be directly compared with the FTM uncertainty as it contains DR measurements, which have greater uncertainty (discussed further below).…”

Section: Resultsmentioning

confidence: 99%

“…H 2 SO 2 and its isomers have been extensively studied by ab initio theory. ,− The consensus that has emerged from these calculations is that the lowest-energy structure is sulfoxylic acid (HOSOH) with C 2 symmetry, followed by another sulfoxylic acid rotamer with C s symmetry, which lies only slightly higher in energy (∼1.3 kcal mol –1 ). Other structures are calculated to be minima on the potential energy surface but are considerably higher in energy; several of these are illustrated in Figure .…”

Section: Introductionmentioning

confidence: 99%

Microwave Detection of Sulfoxylic Acid (HOSOH)

et al. 2013

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Sulfoxylic acid (HOSOH), a chemical intermediate roughly midway along the path between highly reduced (H2S) and highly oxidized sulfur (H2SO4), has been detected using Fourier transform microwave spectroscopy and double resonance techniques, guided by new high-level CCSD(T) quantum-chemical calculations of its molecular structure. Rotational spectra of the two most stable isomers of HOSOH, the putative ground state with C2 symmetry and the low-lying C(s) rotamer, have been measured to high precision up to 71 GHz, allowing accurate spectroscopic parameters to be derived for both isomers. HOSOH may play a role in atmospheric and interstellar chemistry, and the present work provides the essential data to enable remote sensing and/or radioastronomical searches for these species. Spectroscopic characterization of HOSOH suggests that other transient intermediates in the oxidation of SO2 to H2SO4 may be amenable to laboratory detection as well.

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Gas-Phase Structures and Acidities of the Sulfur Oxoacids H2SnO6 (n = 2−4) and H2S2O7

Otto¹,

Steudel²

2001

Eur. J. Inorg. Chem.

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The gas‐phase geometries, dipole moments, enthalpies, and Gibbs free energies of dithionic acid H2S2O6, trithionic acid H2S3O6, tetrathionic acid H2S4O6, and disulfuric acid H2S2O7 have been determined by ab initio MO calculations at various levels of theory. The most stable conformations of H2S2O6 and H2S2O7 are of C2 symmetry, the other two acids are of C1 symmetry. The gas‐phase acidities defined as ΔG°298 of the deprotonation reaction obtained at the {MP2/6‐311++ G(3df, 3pd)//MP2/6‐31+ G(d) + ZPVE[HF/6‐31+ G(d)]} level are as follows [kJ·mol−1]: H2S2O6 1180, H2S3O6 1162, H2S4O6 1156, H2S2O7 1171. All four acids are much stronger than fluorosulfuric acid and chlorosulfuric acid in the gas phase. The decomposition of H2S2O7 into SO3 and H2SO4 is slightly endothermic and the same holds for the decomposition of H2S3O6 into SO3 and H2S2O3, but the reaction of H2S2O6 to SO2 and H2SO4 is strongly exothermic. The structures of the monoanions HS2O6−, HS3O6−, HS4O6−, and HS2O7− are characterized by intramolecular hydrogen bonds.

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Gas-Phase Acidities of Nine Sulfur Oxoacids of Composition [H2,S,On] (n = 1–4)

Cited by 17 publications

References 54 publications

Alternative Conceptions of Common Salt Hydrolysis Among Upper-Secondary-School Students

Alternative Conceptions of Common Salt Hydrolysis Among Upper-Secondary-School Students

Microwave Detection of Sulfoxylic Acid (HOSOH)

Gas-Phase Structures and Acidities of the Sulfur Oxoacids H2SnO6 (n = 2−4) and H2S2O7

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