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Orthoarsenic Acid

MetaUic arsenic is not readily attacked by water, alkaline solutions, or nonoxidizing acids. It reacts with concentrated nitric acid to form orthoarsenic acid [7778-39-4] H AsO. Hydrochloric acid attacks arsenic only in the presence of an oxidant. [Pg.326]

Arsenic trioxide may be made by burning arsenic in air or by the hydrolysis of an arsenic trihaUde. Commercially, it is obtained by roasting arsenopyrite [1303-18-0] FeAsS. It dissolves in water to a slight extent (1.7 g/100 g water at 25°C) to form a weaMy acidic solution which probably contains the species H AsO, orthoarsenous acid [36465-76-6]. The oxide is amphoteric and hence soluble in acids and bases. It is frequendy used as a primary analytical standard in oxidimetry because it is readily attainable in a high state of purity and is quantitatively oxidized by many reagents commonly used in volumetric analysis, eg, dichromate, nitric acid, hypochlorite, and inon(III). [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]

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

Orthoarsenic acid, 3 264—265 Orthoboric acid, 4 242t, 249—255 Orthoclase, hardness in various scales, l 3t Orthocortex, in wool fibers, 11 173 Orthodontics, superelastic and pseudoelastic SMA devices in, 22 350-351 Orthoesters, 10 498 Orthoferrites, 11 56t, 57 Orthogonal matrices, 6 27 ort/io-hydrogen, 13 759, 760—761 Orthokinetic flocculation, 11 631 22 56 Orthokinetic flocculator, 22 59 Orthomyxoviruses, 3 136—137... [Pg.658]

Ordinarily arsenic does not react with water, hydrogen, caustic soda or hydrochloric acid. However, in presence of an oxidant it reacts with concentrated HCl. In concentrated HCl solution it reacts with hydrogen sulfide to form a precipitate of yellow arsenic sulfide, AS2S3. It forms orthoarsenic acid, H3ASO4 on reaction with concentrated nitric acid and chlorinated water. [Pg.63]

Synonyms orthoarsenic acid, arsenic acid hemihydrate... [Pg.63]

Commercial arsenic acid is usually the orthoarsenic acid [7774-M1-6] corresponding to the above hemihydrate formula. The aqueous solution of this acid behaves as a triprotic acid the dissociation constants, Ki, K2 and K3 being 5.6x10-3, 1.7x10 and 3.OxlO-i, respectively. The meta and pyro forms... [Pg.63]

Arsenic pentasulfide is prepared by precipitation from an acidic solution of orthoarsenic acid, H3ASO4, or arsenic pentachloride, AsCls or any other soluble As(V) salt by passing hydrogen sulfide. It may be also prepared by heating a mixture of arsenic and sulfur, extracting the fused mass with ammonia solution and reprecipitating arsenic pentasulfide at low temperature hy addition of HCl. [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]

Arsenic trioxide dissolves in water to a slight extent, undergoing a slow hydrolysis reaction, forming weakly acidic orthoarsenous acid, As(OH)3. [Pg.72]

A method for removing arsenic from well water. The water is filtered through a long pipe filled with iron filings and sand. Water-soluble arsenate ions gain electrons from metallic iron to form less-soluble orthoarsenous acid, which gets trapped by the sand and does not exit the pipe. [Pg.561]

Seven hundred and twenty grams of syrupy arsenic acid (75-80 per cent) is boiled in a beaker until the temperature of the acid is 150° about 120 g. of water is driven off, leaving a syrup containing approximately 95 per cent of orthoarsenic acid, which is then added to 300 g. of phenol in a i-l. round-bottom, short-neck Pyrex flask. By means of a 3-hole stopper, an efficient jacketed stirrer (Org. Syn. 1, 4) and a thermometer are introduced into the flask, and a connection is established with a downward condenser. The flask is set in an oil bath which is heated at once to 155-160°, and the stirrer is run at a rate high enough to insure thorough mixing. [Pg.65]

Arsonic acids may be regarded as derived from orthoarsenic acid, (HO)3As—>0, by replacement of one of the hydroxyl groups with an organic residue the arsinic acids are similarly derived by replacement of... [Pg.415]

SYNS ACIDE ARSENIQUE LIQUIDE (FRENCH) ARSENATE ARSENIC ACID, liquid (DOT) ARSENIC ACID, soUd (DOT] DESICCANT L-10 HI-YIELD DESICCANT H-10 ORTHOARSENIC ACID D RCRA WASTE NUMBER POlO ZOTOX ZOTOXCRAB GRASS KILLER... [Pg.101]

SYNS ARSENIC ACID, soUd pOT) ORTHOARSENIC ACID HEMHYDRATE... [Pg.103]

See other pages where Orthoarsenic Acid is mentioned: [Pg.707]    [Pg.707]    [Pg.1009]    [Pg.268]    [Pg.328]    [Pg.1482]    [Pg.28]    [Pg.29]    [Pg.29]    [Pg.271]    [Pg.64]    [Pg.1482]    [Pg.72]    [Pg.560]    [Pg.561]    [Pg.180]    [Pg.707]    [Pg.707]    [Pg.268]    [Pg.124]    [Pg.132]    [Pg.1820]    [Pg.1820]    [Pg.101]    [Pg.931]    [Pg.451]   
See also in sourсe #XX -- [ Pg.28 ]

See also in sourсe #XX -- [ Pg.1505 ]

See also in sourсe #XX -- [ Pg.4 , Pg.63 ]

See also in sourсe #XX -- [ Pg.1505 ]

See also in sourсe #XX -- [ Pg.28 ]

See also in sourсe #XX -- [ Pg.601 ]

See also in sourсe #XX -- [ Pg.21 ]



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