Phosphoric Acid too old?

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Hurtdogg

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I have a bottle of Phosphoric acid bought probably 15 years ago. Is it still good to use?
 
Good question.
Google "phosphoric acid shelf life" yields "answers" ranging from 2-3 years through 120 months to "indefinite if stored properly".
I suspect the ultimate answer would be based on the gas permeability of the container assuming no other contamination source...

Cheers!
 
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