Abstract
Selenium dioxide dissolves in sulphuric acid and in oleum to give bright yellow solutions. It has been shown by means of conductivity and cryoscopic measurements that in such solutions selenium dioxide behaves as a weak base. It is partially ionized to give the HSeO 2 + ion. Polymeric ions such as HSe 2O 4 + are also present in these solutions. It appears that the un-ionized portion of the selenium dioxide forms compounds with sulphuric acid, e.g. H 2SO 4·SeO 2 and H 2SO 4·Se 2O 4, and with disulphuric acid, e.g. H 2S 2O 7·SeO 2. Tellurium dioxide was found to be insoluble in 100 per cent sulphuric acid and in oleum.
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