Atomistry » Arsenic » Chemical Properties » Potassium Thioarsenates
Atomistry »
  Arsenic »
    Chemical Properties »
      Potassium Thioarsenates »

Potassium Thioarsenates

Potassium Orthothioarsenate, K3AsS4.H2O, may be obtained by treating an aqueous solution of the pyro-salt with alcohol and evaporating the mixture, or by adding excess of potassium sulphide or hydrosulphide to a solution of arsenious sulphide in the aqueous reagent, and evaporating in a vacuum. It crystallises in pale yellow, four-sided prisms, which are hygroscopic. Potassium pyrothioarsenate, K4As2S7, crystallises in rhombic plates2 when an aqueous solution of potassium monohydrogen orthoarsenate is saturated with hydrogen sulphide and allowed to evaporate. If carbon dioxide is passed into the solution, arsenic pentasulphide separates. The addition of alcohol to an aqueous solution of the ortho-salt precipitates potassium metathioarsenate, KAsS3. The ortho-salt is not decomposed on heating, but both the pyro- and meta-salts are converted to thio- arsenites, with loss of sulphur.

Last articles

Xe in 6AYK
Xe in 6QII
Xe in 6ASM
Xe in 5NSW
Xe in 6FY9
Xe in 5O1K
Xe in 5O27
Xe in 5M69
Xe in 5KPU
Xe in 5I63
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy