# Why do disproportionation reactions take place?

I want to know what are the conditions when disproportionation reaction is feasible. Is it just because of stability factors or it has other dimensions to it. As an example: $$\ce{3HNO2 -> HNO3 + 2NO + H2O}$$

Nitrous acid disproportionates to nitric acid and nitrogen monoxide. Here stability of +5 in nitric acid is understandable but how +2 in the monoxide is stable if the disproportionation takes place to gain stability.

Am I ignoring some other factors like pH or hydration enthalpy. I would be very thankful if someone gives me some general ideas on these reactions.

• – user7951 Feb 3 '18 at 7:03