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The Liebermann–Burchard or acetic anhydride test is used for the detection of cholesterol. The formation of a green or green-blue colour after a few minutes is positive. Lieberman–Burchard is a reagent used in a colourimetric test to detect cholesterol, which gives a deep green colour. This colour begins as a purplish, pink colour and ...
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 ...
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 ...
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.
Like concentrated sulfuric acid, oleum is such a strong dehydrating agent that if poured onto powdered glucose, or virtually any other sugar, it will draw the hydrogen elements of water out of the sugar in an exothermic reaction, leaving a residue of nearly pure carbon as a solid. This carbon expands outward, hardening as a solid black ...
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 ...
Vanadium pentoxide is a commercially important catalyst for the production of sulfuric acid, a reaction that exploits the ability of vanadium oxides to undergo redox reactions. [23] The vanadium redox battery utilizes all four oxidation states: one electrode uses the +5/+4 couple and the other uses the +3/+2 couple. Conversion of these ...
Quicklime (calcium oxide) is a base anhydride. It reacts with water to become hydrated lime (calcium hydroxide), [2] which is a strong base, chemically akin to lye. This reaction is exothermic. [2] CaO + H 2 O → Ca(OH) 2 (ΔH r = −63.7 kJ/mol of CaO) Sodium oxide reacts readily and irreversibly with water to give sodium hydroxide: [3] Na 2 ...