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Solid nickel arsenites

Several nickel arsenites [66GME] have been identified, but there are very limited chemical thermodynamic data for these solids. Chukhlantsev [57CHU] dissolved samples of nickel orthoarsenite in dilute nitric acid solutions at 20°C over 12 hours to form solutions with aqueous nickel concentrations of 8.7 x 10 mol-dm at a pH value of 6.75 and 3.1x10 at a pH value of 7.10 mol dm The author did not report a solubility product based on their measurements but, as discussed in Appendix A, if the dissolution of the solid is assumed to correspond to the reaction  [Pg.214]

From this, (V.104) can be calculated and, if the water of hydration is not explicitly included in the chemical formula, [Pg.214]


Sodium orthoarsenate is also obtained electrolytically by the method described under calcium arsenate (p. 198). Yields up to 100 per cent, may be obtained 9 by employing a cell with a diaphragm between iron electrodes. The anolyte should contain sodium arsenite, or sodium hydroxide and arsenious oxide (equivalent to 150 g. As2Os per litre), and the catholyte sodium hydroxide (150 g. per litre). With a current density of 3 amps, per sq. dm. the current efficiency is 100 per cent. A solid crust of sodium arsenate forms around the anode. The process may be rendered continuous by circulating the anolyte and removing the precipitated arsenate. Iron or nickel electrodes are... [Pg.221]


See other pages where Solid nickel arsenites is mentioned: [Pg.214]    [Pg.214]    [Pg.555]    [Pg.555]   


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