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Water - Solubility - Ions

Negative Ions - Sulfite.

Sulfite (SO₃^2-) ions can be identified using dilute hydrochloric acid.
Sulfur dioxide gas is given off
which can be identified with the usual test.

For example

zinc sulfite + hydrochloric acid  zinc chloride + sulfur dioxide + water
ZnSO_3(aq)      +      2HCl_(aq)            ZnCl_2(aq)      +      SO_2(g)    +   H₂O_(l)

In general

sulfite     +        acid          sulfur dioxide    +    water
SO₃^2-_(aq)       +     2H⁺_(aq)              SO_2(g)        +       H₂O_(l)

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