JanaALEVEL
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Is there a test for nitrates we should know of ? The only one I know is add aluminium fillings and then NaOH ? But what are the observations of that ? And is there another test ?
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liam.ro
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The most common one is the one you've outlined:


Firstly, add aqueous NaOH to your unknown substance. Then add aluminium powder or foil, and proceed to heat the mixture strongly.

If nitrate ions are present, they will be reduced to ammonia, giving off ammonia gas. This can be identified by testing it with damp red litmus paper, which will turn blue in its presence.
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