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Sulfur trioxide is a reagent in sulfonation reactions. Dimethyl sulfate is produced commercially by the reaction of dimethyl ether with sulfur trioxide: [20] CH 3 OCH 3 + SO 3 → (CH 3) 2 SO 4. Sulfate esters are used as detergents, dyes, and pharmaceuticals. Sulfur trioxide is generated in situ from sulfuric acid or is used as a solution in ...
Since this test uses acetic anhydride and sulfuric acid as reagents, caution must be exercised so as not to receive severe burns. Method: Dissolve one or two crystals of cholesterol in dry chloroform in a dry test tube. Add several drops of acetic anhydride and then 2 drops of concentrated H 2 SO 4 and mix carefully.
A common type of organic acid anhydride is a carboxylic anhydride, where the parent acid is a carboxylic acid, the formula of the anhydride being (RC(O)) 2 O. Symmetrical acid anhydrides of this type are named by replacing the word acid in the name of the parent carboxylic acid by the word anhydride. [2] Thus, (CH 3 CO) 2 O is called acetic ...
Nitrosylsulfuric acid is the chemical compound with the formula HSO 4 NO. It is a colourless solid that is used industrially in the production of caprolactam, [3] and was formerly part of the lead chamber process for producing sulfuric acid. The compound is the mixed anhydride of sulfuric acid and nitrous acid.
When oxyacids are heated, many of them dissociate to water and the anhydride of the acid. In most cases, such anhydrides are oxides of nonmetals. For example, carbon dioxide, CO 2, is the anhydride of carbonic acid, H 2 CO 3, and sulfur trioxide, SO 3, is the anhydride of sulfuric acid, H 2 SO 4. These anhydrides react quickly with water and ...
The hydration reaction of sulfuric acid is highly exothermic. [19] As indicated by its acid dissociation constant, sulfuric acid is a strong acid: H 2 SO 4 → H 3 O + + HSO − 4 K a1 = 1000 (pK a1 = −3) The product of this ionization is HSO − 4, the bisulfate anion. Bisulfate is a far weaker acid: HSO − 4 + H 2 O → H 3 O + + SO 2− 4 ...
Because of that, sulfuric acid is sometimes concentrated to oleum for in-plant pipelines and then diluted back to acid for use in industrial reactions. In Richmond, California in 1993 a significant release occurred due to overheating, causing a release of sulfur trioxide [ 6 ] that absorbed moisture from the atmosphere, creating a mist of ...
An acid anhydride is a type of chemical compound derived by the removal of water molecules from an acid. In organic chemistry, organic acid anhydrides contain the functional group −C(=O)−O−C(=O)−. Organic acid anhydrides often form when one equivalent of water is removed from two equivalents of an organic acid in a dehydration reaction.