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QUESTION
What is the formal charge for the Phosphate Ion?
Phosphoric acid, ##H_3PO_4##, can form phosphate salts, i.e. salts of ##PO_4^(3-)##.
But in water, you would reach a stoichiometric endpoint at ##"biphosphate"##, i.e. ##HPO_4^(2-)##. See here.
