1. The problem statement, all variables and given/known data
Solid Na2HPO4 is dissolved in water. What is the resulting pH of the solution? Relative pka's of phosphate derivaties are ~2, ~7, and ~12.
2. Relevant equations
No equation needed, just look at the species which phosphate would develop.
3. The attempt at a solution
I believe the specified compound would be in equilibrium between one of these species;
H3PO4, H2PO4 (-), HPO4 (-2) and PO4 (-3). The choices are 12, 7, 2, 9, or there is not enough information.
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