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Arsenic Pentoxide

The arsenic acid solution is prepared by dissolving 123 g. of arsenic pentoxide in 104 ml. of water 100 ml. of the cold solution are used in the experiment. [Pg.992]

Arsenic Peroxides. Arsenic peroxides have not been isolated however, elemental arsenic, and a great variety of arsenic compounds, have been found to be effective catalysts ia the epoxidation of olefins by aqueous hydrogen peroxide. Transient peroxoarsenic compounds are beheved to be iavolved ia these systems. Compounds that act as effective epoxidation catalysts iaclude arsenic trioxide, arsenic pentoxide, arsenious acid, arsenic acid, arsenic trichloride, arsenic oxychloride, triphenyl arsiae, phenylarsonic acid, and the arsenates of sodium, ammonium, and bismuth (56). To avoid having to dispose of the toxic residues of these reactions, the arsenic can be immobi1i2ed on a polystyrene resia (57). [Pg.94]

In an alternative industrial process, resorcinol [108-46-3] is autoclaved with ammonia for 2—6 h at 200—230°C under a pressurized nitrogen atmosphere, 2.2—3.5 MPa (22—35 atm). Diammonium phosphate, ammonium molybdate, ammonium sulfite, or arsenic pentoxide maybe used as a catalyst to give yields of 60—94% with 85—90% selectivity for 3-aminophenol (67,68). A vapor-phase system operating at 320°C using a siUcon dioxide catalyst impregnated with gallium sesquioxide gives a 26—31% conversion of resorcinol with a 96—99% selectivity for 3-aminophenol (69). [Pg.311]

Arsenic Acids and the Arsenates. Commercial arsenic acid, corresponds to the composition, one mole of arsenic pentoxide to four moles of water, and probably is the arsenic acid hemihydrate [7774-41-6] H AsO O.5H2O. It is obtained by treatment of arsenic trioxide with concentrated nitric acid. Solutions of this substance or of arsenic pentoxide in water behave as triprotic acids with successive dissociation constants = 5.6 x 10 , ... [Pg.334]

Arsenic acid (arsenic pentoxide hydrate, arsenic V oxide hydrate, orthoarsenic acid) [12044 50-7] M 229.8 + XH2O, pKj 2.26, pK 6.76, pKj 11.29 (H3ASO4). Cryst from cone solns of... [Pg.397]

Amino-3-fluorophenol Arsenic acid and its salts Arsenic pentoxide Arsenic trioxide Asbestos (all types)... [Pg.92]

Chemical Designations - Syrurrtyms Arsenic Pentoxide Orthoarsenic Acid Chemical Formula AsjOj or HjAsO lAHjO. [Pg.28]

Since the corresponding nitro derivative is not always available, other oxidants have also found application—e.g. arsenic pentoxide. [Pg.262]

Anon, Arsenic Pentoxide, Analyzed Reagent , MlL-A-51313 (May 1969) 9) ChemRubHdb... [Pg.448]

Arsenic pentoxide (wood ashes Several deaths after eating ashes (780 mg/kg dry weight) 2... [Pg.1524]

Arsenic pentoxide (As O ) is manufactured by adding oxygen to the trioxide form and is used to form many arsenic compounds. [Pg.217]

Allyl alcohol Aluminum phosphide 4-Aminopyridine Arsenic acid Arsenic pentoxide Arsenic trioxide Calcium cyanide Carbon disulfide p-Chloroaniline... [Pg.522]

Arsenic acid is prepared by treating arsenic trioxide with concentrated nitric acid or by combination of arsenic pentoxide with water. The latter reaction is very slow. It is also formed when meta- or pyroarsenic acid is treated with cold water. [Pg.64]

Arsenic pentoxide is used to make colored glass in fungicide formulations in adhesive for metals in wood preservatives in dyeing and printing and to prepare arsenates. [Pg.65]

Arsenic pentoxide is prepared by dehydration of crystalline arsenic acid at 200°C or above. The former is made by treating arsenic metal or arsenious oxide with nitric acid. Also, the pentoxide can be prepared by the reaction of arsenic trioxide with oxygen under pressure. [Pg.65]

The aqueous solution of arsenic pentoxide is arsenic acid which probably corresponds to the hemihydrate formula H3ASO4 O.5H2O. See Orthoarsenic acid. It behaves as a triprotic acid forming various arsenate derivatives of metals. [Pg.66]

Oxidation in air at elevated temperatures form arsenic along with arsenic trioxide or arsenic pentoxide, the nature of the product depending on the arsine to oxygen ratio ... [Pg.74]

See other pages where Arsenic Pentoxide is mentioned: [Pg.830]    [Pg.1155]    [Pg.72]    [Pg.268]    [Pg.333]    [Pg.334]    [Pg.6]    [Pg.200]    [Pg.255]    [Pg.19]    [Pg.220]    [Pg.4]    [Pg.6]    [Pg.465]    [Pg.830]    [Pg.11]    [Pg.105]    [Pg.1424]    [Pg.1482]    [Pg.29]    [Pg.29]    [Pg.65]    [Pg.65]    [Pg.66]    [Pg.1105]    [Pg.1482]   
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