[pyngjls]

Hi all,

I need to make a pH 7 phosphate buffer using lithium phosphate. Ideally I should have Li₂HPO₄ and LiH₂PO₄ to make the buffer, but we only have Li₃PO₄ available. It also seems that commercially, only LiH₂PO₄ is available.

Does anyone have an idea of how a pH 7 buffer can be made using only Li₃PO₄? And if there are any reactions that can be done to make the dihydrogen and monohydrogen salts using Li₃PO₄?

[Borek]

Just acidify solution with phosphoric acid.

[Babcock_Hall]

I agree with Borek.  The only thing I can add is that in my experience Li₃PO₄ is not very soluble on its own, but I imagine that it will come into solution in the presence of phosphoric acid.