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Sulfuric(IV) acid (United Kingdom spelling: sulphuric(IV) acid), also known as sulfurous (UK: sulphurous) acid and thionic acid, [citation needed] is the chemical compound with the formula H 2 SO 3. Raman spectra of solutions of sulfur dioxide in water show only signals due to the SO 2 molecule and the bisulfite ion, HSO − 3 . [ 2 ]
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The decomposition products can include sulfur, sulfur dioxide, hydrogen sulfide, polysulfanes, sulfuric acid and polythionates, depending on the reaction conditions. [6] Anhydrous methods of producing the acid were developed by Max Schmidt: [6] [7] H 2 S + SO 3 → H 2 S 2 O 3 Na 2 S 2 O 3 + 2 HCl → 2 NaCl + H 2 S 2 O 3 HSO 3 Cl + H 2 S → ...
The sulfur trioxide is absorbed into 97–98% H 2 SO 4 to form oleum (H 2 S 2 O 7), also known as fuming sulfuric acid or pyrosulphuric acid. The oleum is then diluted with water to form concentrated sulfuric acid. H 2 SO 4 + SO 3 → H 2 S 2 O 7 H 2 S 2 O 7 + H 2 O → 2 H 2 SO 4
For example, 10% oleum can also be expressed as H 2 SO 4 ·0.13611SO 3, 1.13611SO 3 ·H 2 O or 102.25% sulfuric acid. The conversion between % acid and % oleum is: % = + % For x = 1 and y = 2 the empirical formula H 2 S 2 O 7 for disulfuric (pyrosulfuric) acid is obtained. Pure disulfuric acid is a solid at room temperature, melting at 36 °C ...
3 O 2− 10: Pure disulfuric acid melts at 36 °C. Present in fuming sulfuric acid, oleum. Examples known for n = 1 and n = 2. Peroxymonosulfuric acid: H 2 SO 5 +6 Peroxomonosulfate, OOSO 2− 3 "Caro's acid", a solid melting at 45 °C Peroxydisulfuric acid: H 2 S 2 O 8 +6 Peroxydisulfate, O 3 SOOSO 2− 3 "Marshall's acid", a solid melting at ...
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Typical conditions involve heating the aromatic compound with sulfuric acid: [2] C 6 H 6 + H 2 SO 4 → C 6 H 5 SO 3 H + H 2 O. Sulfur trioxide or its protonated derivative is the actual electrophile in this electrophilic aromatic substitution. To drive the equilibrium, dehydrating agents such as thionyl chloride can be added: [2] C 6 H 6 + H 2 ...
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