Strontium thiosulfate has the molecular formula of
SrS2O3 and the molecular weight of 199.7502 g/mol. It
can be prepared by the reaction of sodium thiosulfate
upon the chloride:
SrCl2+Na2S2O3 ? SrS2O3+2NaCl
It is moderately soluble in water (12.5 g/100 ml at
15°C) so that the solution must be evaporated at a low temperature to crystallize the product (salt-out temperature ～15°F (-9.4°C). A pentahydrate, SrS2O3·5H2O, is
the result.Its density is 2.17 g/cm3
and it loses four waters of hydration at 100°C and
decomposes at 225°C. In air, it forms sulfur plus strontium
sulfate but the decomposition in an inert atmosphere
remains unknown.
It is insoluble in ethanol and acetone. Its solubility in
water varies with temperature.
