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Water - Solubility - Ions

Negative Ions - Nitrate.

Add sodium hydroxide solution and aluminium powder
to the solution containing the nitrate ions.

The aluminium reduces the nitrate ion (NO3-)
to an ammonium ion (NH4+).
The ammonium ion reacts with hydroxide
 to produce ammonia gas and water (see alkalis).

ammonium  +  hydroxide    ammonia + water
 NH4+(aq)     +     OH-(aq)      NH3(g)  +  H2O(l)

Ammonia gas can be identified with the usual test.

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