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Water - Solubility - Ions

Negative Ions - Sulfite.

Sulfite (SO32-) 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 sulfitehydrochloric acid arrow zinc chloridesulfur dioxide + water
ZnSO3(aq)   +      2HCl(aq)       arrow    ZnCl2(aq)   +       SO2(g)  +   H2O(l)

In general

sulfite     +        acid       arrow   sulfur dioxide    +    water
SO32-(aq)    +   2H+(aq)     arrow       SO2(g)      +       H2O(l)

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