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Arsenic acid hemihydrate

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]

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

Arsenic acid hemihydrate (H3AsO4-0.5H2O) 2.5 35.5 300 (decomposes) Fide (2007) O Neil et al. (2001)... [Pg.17]

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]

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]

The monohydrate, FeAs04.H20, is formed when anhydrous ferric arsenate, arsenic acid, hydrogen peroxide and water are heated in a sealed tube for 14 days at 170° C. a hemihydrate may be obtained in a similar manner by substituting precipitated ferric dihydrogen arsenate for the normal salt. [Pg.204]

Lithium Arsenates.—Lithium Orthoarsenate is obtained as the hemihydrate, 2Li3As04.H30, by the action of lithium carbonate on arsenic acid and allowing the solution to crystallise.4 The anhydrous salt is prepared by recrystallising this hydrate from fused lithium chloride 5 rhombic crystals of density 3-07 at 15° C. are obtained. These are soluble in dilute acetic acid they are extremely stable and may be heated to a white heat without fusion. With excess of arsenic acid the normal salt yields deliquescent rhombic prisms of lithium dihydrogen arsenate, 2LiH2As04.3H20, which with water revert to the normal salt.6... [Pg.208]

See other pages where Arsenic acid hemihydrate is mentioned: [Pg.72]    [Pg.72]    [Pg.103]    [Pg.1520]    [Pg.699]    [Pg.691]    [Pg.678]    [Pg.773]    [Pg.737]    [Pg.771]    [Pg.691]    [Pg.72]    [Pg.72]    [Pg.103]    [Pg.1520]    [Pg.699]    [Pg.691]    [Pg.678]    [Pg.773]    [Pg.737]    [Pg.771]    [Pg.691]    [Pg.577]    [Pg.209]    [Pg.952]    [Pg.297]    [Pg.451]    [Pg.577]    [Pg.126]    [Pg.561]   
See also in sourсe #XX -- [ Pg.4 , Pg.63 ]



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