I buggered me for quite some time why NaOH deteriorates over time..
I foiund the reason for this
here:
Quote:
10. Stability and Reactivity
Stability:
Stable under ordinary conditions of use and storage. Very hygroscopic. Can slowly pick up moisture from air and react with carbon dioxide from air to form sodium carbonate.
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So, it's not oxidation, but reaction with water and CO2 from athmosphere.. carbonation
I am happy now...