I've never fully understood why students have trouble with conjugate acids/bases.
If you want the conjugate acid of something, add a H^+ to what you have. If you want the conjugate base of something, take a H^+ away from what you have.
What is the conjugate acid of HPO4^2-(aq)?
A. H3PO4(aq) B. HPO4^2-(aq) C. H2PO4-(aq)
D. PO4^3-(aq) E. H3O+(aq)
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