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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