Hyposulfite, SO22−, was reported as a sulfur oxyanion. However salts containing SO22− and HSO2− are not well characterized. They would be conjugate bases derived from the parent hyposulfurous acid (H2SO2), which is also of doubtful existence. The brown crystalline material cobalt hyposulfite, CoSO2, is similarly claimed to result from the re...
Thiosulfate, hydrosulfite
Also calleda salt of hyposulfurous acid. · See