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QUESTION

# What is phosphate's electron configuration?

The charges formally reside on the oxygen atoms, as we would expect for this strongly electronegative atom.

There are 5+4xx6+3=32" valence electrons" for PO_4^(3-), and a formal Lewis structure of O=P(-O^-)_3 is proposed. What is your prediction with respect to the structure of the phosphate ion?

Note that when we titrate phosphporic acid H_3PO_4 with sodium hydroxide, we get mainly HPO_4^(2-) at the endpoint in aqueous solution.