What happens to integrity of sodium nitrite (NaNo², CAS: 7632-00-0) of AR grade when it gets exposed to air?
If container has been opened and chemical has been exposed to air for a few minutes and then closed again, it's integrity keeps getting affected? Is purity affected as well?
If air happens to contain humidity, does it potentiate the effect on chemical's integrity?
Does this type of chemical expire and how long can it be stored unopened? What happens after chemical has reached its expiration?
How long can it be stored after being exposed to air and then closed in it's container for later projects? Additionally, as far as integrity and purity are concerned, is it reliable for repeated use for important project?