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Perchloric acid is a mineral acid with the formula H Cl O 4. It is an oxoacid of chlorine . Usually found as an aqueous solution, this colorless compound is a stronger acid than sulfuric acid , nitric acid and hydrochloric acid .
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Nitrosyl perchlorate was first produced in 1909 by passing dinitrogen trioxide gas into concentrated perchloric acid: [1] [2]. N 2 O 3 + 2 HClO 4 → 2 NOClO 4 + H 2 O. A standard laboratory preparation involves treating a mixture of nitric oxide and nitrogen dioxide with concentrated perchloric acid: [3]
Nitrating acid mixtures, spent with more than 50 percent nitric acid or Nitrating acid mixtures, spent with not more than 50 percent nitric acid UN 1827: 8: Stannic chloride, anhydrous UN 1828: 8: Sulfur chlorides: UN 1829: 8: Sulfur trioxide, inhibited or Sulfur trioxide, stabilized UN 1830: 8: Sulfuric acid with more than 51 percent acid UN ...
Hydronium perchlorate is produced by the reaction of anhydrous perchloric acid and water in a 1:1 molar ratio: [2]. HClO 4 + H 2 O → [H 3 O] + ClO − 4. A more analytically reliable method was reported using the macrocyclic Schiff base of sodium 2,6-diformyl-4-methylphenolate and 2,6-diformyl-4-methylphenol as a chelating agent to sequester Cu(II): transmetallation of the macrocycle with ...
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Zinc powder, after being dissolved in sulfuric or hydrochloric acid, for standardization of EDTA solutions Such standards are often used to make standard solutions . These primary standards are used in titration and are essential for determining unknown concentrations [ 1 ] or preparing working standards.
Barium perchlorate is also used for the determination of small concentrations (down to 10 ppm, with an accuracy of +/- 1 ppm) of sulfate. [5] In order for the titration to be successful, a high concentration of a nonaqueous solvent, such as ethyl alcohol, 2-propanol, or methanol, must be present. Thorin is typically used as the indicator.