Atomistry » Arsenic » Chemical Properties » Ammonium Thioarsenates
Atomistry »
  Arsenic »
    Chemical Properties »
      Ammonium Thioarsenates »

Ammonium Thioarsenates

Ammonium Orthothioar senate, (NH4)3AsS4, separates as colourless prisms when alcohol is added to a hot solution containing arsenic pentasulphide and excess of ammonium hydrosulphide. The crystals gradually turn yellow in air and, when heated, melt and decompose, yielding ammonium sulphide, arsenious sulphide and sulphur.

Ammonium Pyrothioarsenate, (NH4)4As2S7

Ammonium Pyrothioarsenate, (NH4)4As2S7, has been described as a reddish-yellow mass obtained by evaporation of an ammoniacal solution of arsenic pentasulphide. It is stable at the ordinary temperature, but decomposes on heating. If the ammoniacal solution is filtered and evaporated in vacuo, the composition of the yellow residue is (NH4)5As3S10. According to McCay and others, the solution of arsenic pentasulphide in ammonia contains the orthothioarsenate and thioxyarsenates. The yellow solution on keeping becomes almost colourless and slightly turbid, owing to separation of sulphur produced by decomposition of the thioxyarsenates.

Last articles

Cl in 3ZZF
Cl in 3ZZW
Cl in 3ZXV
Cl in 3ZXR
Cl in 3ZZE
Cl in 3ZXQ
Cl in 3ZX6
Cl in 3ZXD
Cl in 3ZX2
Cl in 3ZX0
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy