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Sulfurous acid is commonly known to not exist in its free state, and due to this, it is stated in textbooks that it cannot be isolated in the water-free form. [4] However, the molecule has been detected in the gas phase in 1988 by the dissociative ionization of diethyl sulfite. [5]
Although nearly 100% sulfuric acid solutions can be made, the subsequent loss of SO 3 at the boiling point brings the concentration to 98.3% acid. The 98.3% grade, which is more stable in storage, is the usual form of what is described as "concentrated sulfuric acid".
In the 1990s, G. Frederick Smith Chemical Co. shortened its name to GFS Chemicals, Inc. and acquired Ericsen Instruments' Karl Fischer reagent business (now the Watermark brand), and several other specialty organic product lines from Farchan Laboratories and Shawnee Chemical Company. [10] [21] In the 90s, GFS became ISO 9001:2008 Certified.
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The sulfoxylate ion apparently has an X-ray absorption near edge structure at 2476.1 eV. With sulfur the X-ray absorption edge changes with oxidation state as per Kunzl's law. The edge corresponds to the energy needed to excite and inner 1 S electron to a 3 P orbital. [7] Sulfoxylate has an infrared absorption peak at 918.2 cm −1. [7]
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Chemical Abstracts Service Building B in August 2009. Columbus, Ohio. STN (Scientific & Technical Information Network) International is operated jointly [4] by CAS and FIZ Karlsruhe, and is intended primarily for information professionals, using a command language interface.
Calcium bisulfite (calcium bisulphite or calcium hydrogen sulfite) is an inorganic compound which is the salt of a calcium cation and a bisulfite anion. It may be prepared by treating lime with an excess of sulfur dioxide and water. As a food additive it is used as a preservative under the E number E227.