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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−)
  • 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.[1]


  1. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.