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How long until sodium nitrite becomes sodium nitrate when exposed to oxygen?

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DaveMills:
How often can sodium nitrite be exposed to oxygen until it oxidizes into sodium nitrate and how long will the process take?

Hunter2:
In short term nothing  happens. Maybe in some years it will be converted.

Corribus:
Rates of reaction depend (for a start) on (1) temperature, (2) concentrations, (3) pH, (4) phases of reactants, and (5) particle size (in the case of solids). It is impossible to answer this question generally.

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