We’re being asked to determine the conjugate base of H2PO4–.
Recall that the conjugate base of an acid is simply the compound formed when an acid loses a hydronium ion (H+). It's considered as a base because it can gain H+ to reform the acid.
What is the conjugate base of H2PO4–(aq)?
A) HPO4–
B) H3O+
C) HPO42−
D) H2PO4
E) H3PO4
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