Question

Which of these acids has more equivalence points in its titration curve? `"H"_2"SO"_4` or `"H"_3"PO"_4`? How can you tell which one is the weaker acid?

Answer 1

Go with the second one

Explanation:

Not all acids ionize or dissociate in the same way and produce the same concentration of `H^+`. There is some difference.

The one that produces more equivalence points for the titration is `"H"_3"PO"_4`. One can obtain from the first half-equivalence point the `pK_a` of each acid + compare.