The sodium salt of this acid may be prepared by the action of tellurium dioxide on an aqueous solution of sodium thiosulphate in the presence of hydrochloric acid:
TeO2 + 4Na2S2O3 + 4HCl = Na2TeS4O6 + Na2S4O6 + 4NaCl + 2H2O, The salt decomposes in the presence of alkali with separation of tellurium. |