What could you add to a Na3PO4 solution to form a buffer?
(a) NaCl (b) K3PO4 (c) NaOH (d) HCl
Na3 PO4 + 3H2O --> <-- 3NaOH + H3PO4
Na3PO4 is the conjugate base of the weak acid H3PO4
I know that Na3PO4 will dissociate into ions in solution, leaving the PO43- ion.
If I could add anything to the solution, I would add H3PO4 to the solution to make the buffer, but it is not one of the options.