Chromic perchlorate

Chromic Perchlorate. Cr(C104)3, mw 350.30, OB to CrO HCI +28.5% only the hexahydrate has been prepd as blue-green delq crysts, mp 94° (Refs 1, 5 6) CA Registry No 13537-21-8 Preparation. By dissolving hydrated chromic oxide in 20% perchloric ac followed by-evapn of the soln (Ref 4)... 

Hexammine Chromic Perchlorate. [Cr(NH3)6] (C104)3 mw 452.57. This inorg coordination compd was studied from the standpoint of its stab sensitivity vs loading density for possible use as an initiating compd. It was found to increase in sensitivity until an apparent max point was reached. The stab sensitivity of the compd also appeared to be affected by humidity. The compd exhibited a sensitivity of 28 inch-ounces as compared to 12 inch-... 

Chromic acid, nitric acid, hydroxyl-containing compounds, ethylene glycol, perchloric acid, peroxides, or permanganates Concentrated nitric and sulphuric acid mixtures Chlorine, bromine, copper, silver, fluorine or mercury Carbon dioxide, carbon tetrachloride, or other chlorinated... 

Chromic acid, nitric acid, hydroxyl-containing compounds, ethylene glycol, perchloric acid, peroxides, and permanganates. 

Effect of Heat. In 1910, R. Roth reported that the blue-green hexahydrate turns green on heating. At 110° w is lost, then perchloric ac, followed by decompn at 210° into chromyl chloride and chromic ac (Ref 3)... 

Hazards arising from the oxidation of organic compounds are greater when the reactants are volatile, or present as a dust or an aerosol. Liquid oxygen and various concentrated acids, e.g. nitric, sulphuric or perchloric acid, and chromic acid are strong oxidizing agents. The use of perchloric acid or perchlorates has resulted in numerous explosions their use should be avoided when possible (refer to Table 6.5). 

The early studies on the exchange system, carried out by Muxart et al., Menker and Garner, and Burgus and Kennedy, showed the exchange to be slow in sulphate , perchlorate, nitrate, and hydroxide media -. The isotopic method ( Cr) was used with separation of the Cr(III) and Cr(VI) being achieved by the precipitation of chromic oxide and lead chromate. Some evidence was obtained for the retardation of the exchange by hydrogen ions. 

In a perchlorate medium the oxidation of hydroquinone to p-benzoquinone by chromic acid obeys the rate expression ... 

Though formazans can be protonated, there are no reports of isolation of formazan cations. The study of the basicity of formazans is complicated by the fact that exposure to acid can lead to irreversible chemical changes. Recently, the protonation of the triaryl formazan 194 with perchloric acid in aprotic solvents has been studied spectroscopically. In this a hypso-chromic shift is observed and is more pronounced when X is an electron-donating substituent. Thus, the shift is 33, 14, and 73nm when X is hydrogen, /Mnethoxy, and w-nitro, respectively.337... 

Redox titrants (mainly in acetic acid) are bromine, iodine monochloride, chlorine dioxide, iodine (for Karl Fischer reagent based on a methanolic solution of iodine and S02 with pyridine, and the alternatives, methyl-Cellosolve instead of methanol, or sodium acetate instead of pyridine (see pp. 204-205), and other oxidants, mostly compounds of metals of high valency such as potassium permanganate, chromic acid, lead(IV) or mercury(II) acetate or cerium(IV) salts reductants include sodium dithionate, pyrocatechol and oxalic acid, and compounds of metals at low valency such as iron(II) perchlorate, tin(II) chloride, vanadyl acetate, arsenic(IV) or titanium(III) chloride and chromium(II) chloride. 

See Chromic acid, also Hydrochloric acid, also Perchloric acid, all above... 

Ethyl sulfate Flammable liquids Fluorine Formamide Freon 113 Glycerol Oxidizing materials, water Ammonium nitrate, chromic acid, the halogens, hydrogen peroxide, nitric acid Isolate from everything only lead and nickel resist prolonged attack Iodine, pyridine, sulfur trioxide Aluminum, barium, lithium, samarium, NaK alloy, titanium Acetic anhydride, hypochlorites, chromium(VI) oxide, perchlorates, alkali peroxides, sodium hydride... 

The formation from neutral substances (triphenylcarbinol) of coloured, salt-like reaction products which are more or less easily decomposed by water is a phenomenon called halochromism . The halo-chromic salts of triphenylcarbinol are regarded as carbonium salts this follows at once from the above discussion. A quinonoid formula, by which various authors explain the colour, seems less probable. Recently the attempt has been made to attribute complex formulae to the carbonium salts (Hantzsch), in accordance with Werner s scheme for ammonium salts. Such formulae express the fact that, in the ion, the charge is not localised at the methane carbon atom, but spread over the field of force of the whole radicle. The simplest carbonium salt of the group, the yellow perchlorate (K. A. Hofmann), would accordingly have the following structural formula ... 

Chlorine dioxide, 4042 Chlorosulfuric acid, 3997 Chloryl perchlorate, 4104 Chromic acid, 4229 Chromium pentafluoride, 4226 Chromium trioxide, 4242 Chromyl acetate, 1494... 

Chromic Azide Complexes. See Chromium Azide Complexes in Vol 1, pA530-R and also Azidopentammine-chromium (III) Perchlorate, Chloropentamminechromium (III) Azide and Hexamminechromium Azide on pA277 under Ammines... 

Chlorine dioxide, 4036 Chlorosulfuric acid, 3991 Chloryl perchlorate, 4098 Chromic acid, 4223 Chromium pentafluoride, 4220 Chromium trioxide, 4236 Chromyl acetate, 1490... 

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