After preparing of Na2HPO4 and NaH2PO4, how long I can use them to prepare PBS?

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Vicente Mendoza Reyes

A one-year shelf-life is reasonable, assuming you prepared the solution in a sterile and aseptic method and environment.

John Poh

You may want to pH the solution if you had originally prepared them to a specific pH... pH will change over time.

Tausif Alam

As long as your stock solutions are sterile and perfectly sealed, you can use them as long as you wish.