Consider the following acids and their dissociation constants.
HPO42-(aq) + H2O(l) H3O+(aq) + PO43-(aq) Ka = 2.2 10-13
HCOOH(aq) + H2O(l) H3O+(aq) + HCOO-(aq) Ka = 1.8 10-4
(a) Which is the weaker acid, HPO42- or HCOOH?
(b) What is the conjugate base of HPO42-? (Type your answer using the format H3PO4 for H3PO4, (NH4)2CO3 for (NH4)2CO3, [NH4]+ for NH4+, and [Ni(CN)4]2- for Ni(CN)42-.)
(c) Which acid has the weaker conjugate base?
(d) Which acid has the stronger conjugate base?
HCOOH forms the weaker conjugate base