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Disulfurous acid, metabisulfurous acid or pyrosulfurous acid is an oxoacid of sulfur with the formula H 2 S 2 O 5.Its structure is HO−S(=O) 2 −S(=O)−OH.The salts of disulfurous acid are called disulfites or metabisulfites.
Formal oxidation number Structure Related anions Notes Sulfuric acid: H 2 SO 4 +6 Sulfate, SO 2− 4 and hydrogen sulfate commonly known as bisulfate, HSO − 4: Best known and industrially significant. Polysulfuric acids including disulfuric acid (pyrosulfuric acid) H 2 SO 4 ·nSO 3 +6 Disulfate (commonly known as pyrosulfate), S 2 O 2− 7 ...
It is a low oxidation state (+1) sulfur acid. [4] It is the Arrhenius acid for disulfur monoxide . Salts derived from thiosulfurous acid, which are also unknown, are named "thiosulfites", "thionosulfites" or "sulfurothioites".
The number indicates the degree of oxidation of each element caused by molecular bonding. In ionic compounds, the oxidation numbers are the same as the element's ionic charge. Thus for KCl, potassium is assigned +1 and chlorine is assigned -1. [4] The complete set of rules for assigning oxidation numbers are discussed in the following sections.
One laboratory scale preparation of Caro's acid involves the combination of chlorosulfuric acid and hydrogen peroxide: [6]. H 2 O 2 + ClSO 2 OH ⇌ H 2 SO 5 + HCl. Patents include more than one reaction for preparation of Caro's acid, usually as an intermediate for the production of potassium monopersulfate (PMPS), a bleaching and oxidizing agent.
Element Negative states Positive states Group Notes −5 −4 −3 −2 −1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 Z; 1 hydrogen: H −1 +1: 1 2 helium: He 0 18
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Disulfuric acid (alternative spelling disulphuric acid) or pyrosulfuric acid (alternative spelling pyrosulphuric acid), also named oleum, is a sulfur oxoacid. [3] It is a major constituent of fuming sulfuric acid, oleum, and this is how most chemists encounter it.