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Not to be confused with hydrosulfite, which is another name for the dithionite anion (S2O42−).
Hyposulfite may refer to:
- The thiosulfate anion (S2O32−)
- Sodium thiosulfate, a salt containing the thiosulfate anion
- SO22−, a reported 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.