Perchloric Arid

Add enough perchloric arid to cover the tissue sample. Add the same volume of perchloric acid to the standard saffl es.ctf DNA. 

Ikeottyetition.—By boiling, it is decomposed into perchloric arid, water, chlorine, and oxygen i -... 

Gascon and co-workers developed an analytical method suitable for the determination of 1,2-epoxy-2,4,4-trimethylpentane.<2D The epoxide was heated at 100° in a sealed tube with di-n-butylamine, and the resulting product aoetylated with acetic anhydride. Titration with perchloric arid in aoetie acid containing a suitable indicator gave the amount of tertiary amine formed. 

Mootz D, Oellers E-J, Wiebcke M (1987) First examples of type I clathrate hydrates of strong acids polyhydrates of hexafluorophosphoric, tetrafluoroboric, and perchloric arid. J Am Chem Soc 109 1200-1202... 

The reaction mixture contained 100 /xL of serum sample 400 /xL of 0.8 mM cytidine in 50 mM potassium phosphate buffer (pH 7.0). The tubes were capped and incubated for 20 minutes at 56°C. Aliquots of 400 /u.L were then removed and added to 100 /xL of cold 6% (v/v) perchloric arid containing 0.75 mM allopurinol. Mixing was followed by addition of 500 /xL of 100 mM ammonium acetate (pH 7.0). The supemate obtained by centrifugation was then analyzed by HPLC. 

Perchloric arid is one of the strongest acids known, but in sulfuric acid it is practically a nonelectrolyte, behaving as a very weak acid ... 

Ellern (Ref 5) comments on its use in pyrot delay compns arid heating devices Specification. A US Military Specification (MIL-P-11970B, 23 Aug 1973) entitled, Potassium Perchlorate, Technical Grade , covers Dept of Defense fequirements. They state that the material shall be in the form of dark purple crystals and shall assay at not less than 97.0%... 

Generally epoxide hydrations cited here will be of two types. The first involves heating the epoxide with water alone at 100-125°. frequently in a sealed tube The second, treating it with water at moderate temperaturew in the presence of a trace of acid. Meet commonly employed for this purpose is sulfuric acid although perchloric acid has likewise keen reported oil occasion Acetic acid, formic acid, hydrochloric add, hydrobromjc acid, and hydroiodio arid can be used... 

Hull and Conant in 1927 showed that weak organic bases (ketones and aldehydes) will form salts with perchloric acid in nonaqueous solvents. This results from the ability of perchlonc aad in nonaqueous systems to protonate these weak bases. These early investigators called such a system a superacid. Some authorities believe that any protic acid that is stronger than sulfunc aad (100%) should be typed as a superaad. Based upon this criterion, fluorosulfuric arid and trifluoro-methanesulfonic acid, among others, are so classified. Acidic oxides (silica and silica-aluminai have been used as solid acid catalysts for many years. Within the last few years, solid acid systems of considerably greater strength have been developed and can he classified as solid superacids. 

Only perchloric and periodic acids exist neither perbromic arid nor per-bromates occur. Perchloric acid distils as a colourless oily liquid when a perchlorate is heated with concentrated II2SO4 at 10-20 mm pressure. The hot, concentrated liquid is hable to detonate in the presence of a trace of reducing agent, particularly a carbon compound. The cold, aqueous acid gives hydrogen with Zn and Fe,... 

Sodium nitrate deposits are less widespread than the other major types of chemical crust or sediment that are found in different parts of the world. Indeed, the only deposits of any great spatial extent and thickness are those of portions of the hyper-arid Atacama Desert in South America. These materials are, in the words of Ericksen (1983, p. 366), so extraordinary that, were it not for their existence, geologists could easily conclude that such deposits could not form in nature . Ericksen notes a series of features of the deposits that defy rational explanation. These include their restricted distribution in a very salty area, their occurrence in a wide variety of topographic settings, the abundance of nitrate minerals, and the presence of a series of other minerals, such as perchlorate, that do not occur in any other saline complexes and the origin of which is obscure. 

A. H. Otto, S. Schrader, T. Steiger, M. Schneider, J. Chem. Soc. Faraday Trans. 1997, 93, 3927-3930. Gas-phase deprotonation of snlfnric acid, perchloric acid, chlorosulfonic acid and flnorosulfonic arid. 

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