Hydrogen sulfite ion has the formula HSO₃⁻.

Here's a breakdown of the difference:

* Hydrogen sulfide (H₂S) is a compound containing two hydrogen atoms and one sulfur atom. It is a colorless, flammable gas with a strong, unpleasant odor.

* Hydrogen sulfite ion (HSO₃⁻) is an ion containing one hydrogen atom, one sulfur atom, and three oxygen atoms. It has a negative charge.

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