Hyposulfite

Hyposulfite, SO₂²⁻, was reported as a sulfur oxoanion. However salts containing SO₂²⁻ and the corresponding acid, hyposulfurous acid (H₂S₂O₂) are not believed to exist.

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The word hyposulfite is also a synonym for the thiosulfate ion, S₂O₃²⁻.

As opposed to hydrosulfite which is a synonym for the dithionite ion, S₂O₄²⁻.

Related sulfur oxoanions

• SO₅²⁻ persulfate ion
• SO₄²⁻ sulfate ion
• SO₃²⁻ sulfite ion

References

Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.