Question

which of the following species is the strongest base in an aqueous solution a) H3PO4 b)...

which of the following species is the strongest base in an aqueous solution a) H3PO4 b) H2PO4 c) HPO4^2- d) PO4^3-

Homework Answers

Answer #1

Phosphoric acid is a weak acid, as it does not fully dissociate into its component ions.
The steps of dissociation are below:

H3PO4 --> H+ + H2PO4(-)
H2PO4(-) --> H+ + HPO4(2-)
HPO2(2-) --> H+ + PO4(3-)

The dissociation of each subsequent ion occurs less than the previous dissociation, as indicated by the continuous change in pKa (2, 7, and 12 respectively). Each of those species, H2PO4(-) and HPO4(2-) can also be considered acids, but, again, they are weak acids because they do not fuly dissociate.

Therefore, stronger base is PO4^3-

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