# How do you write an equation that shows the reaction of phosphate ions, "PO"_4^(3-)" reacting with hydronium ions, "H"_3"O"^(+)"?

"H"_3"O"^+("aq") + "PO"_4""^(3-)("aq") $r i g h t \le f t h a r p \infty n s$ "HPO"_4""^(2-)("aq") + "H"_2"O"("l")