Note 39 — Chapter XIX · PHOSPHORUS AND THE OTHER ELEMENTS OF THE FIFTH GROUP
George Kamensky translation
Adie (1889) obtained compounds of As2O3 with 1, 2, 4, and 8 SO3 by the direct action of ordinary and Nordhausen sulphuric acid upon As2O3. Weber had previously obtained As2O3SO3 (which disengages SO3 at 225°), and also other As2O3nSO3 (where n = 3, 6, and 8), by the action of the vapours of SO3 upon As2O3 at a definite temperature. The compound As2O3,8SO3 loses SO3 at 100°. Oxide of antimony, Sb2O3, gives similar compounds. Adie (1891) also obtained (by the action of SO3 upon H3PO4) a compound H3PO43SO3 in the form of a viscous liquid decomposed by water.