Answers: 2
is a conjugate base of 
but it has one acidic hydrogen which dissociates in the solution and exists in the equilibrium as shown below:
for ![K_a=\frac {[H_3O^+][PO_4^{3-}]}{[HPO_4^{2-}]}](/tpl/images/0225/1393/23eec.png)
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Write the acidic equilibrium equation for hpo42...
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