Consider the titration of 15.0 mL of 0.200 M H 3PO4(aq) with 0.200 M NaOH(aq). What is/are the major species in solution after the addition of 15.0 mL of base?
1. H3PO4(aq) and H2PO4− (aq)
2. H2PO4− (aq) and HPO4− (aq)
3. PO43− (aq)
4. H2PO4− (aq)
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