What is the conjugate acid of HPO2^2-?

1 Answer
mason m · Truong-Son N.
Dec 12, 2015

"H"_2"PO"_2^-H2PO−2

Explanation:

If we can find the conjugate acid of "HPO"_2^(2-)HPO2−2, then "HPO"_2^(2-)HPO2−2 itself is a base.

Since it has a negative charge, it must lack a positive charge, i.e. it lacks a proton. Therefore, it wants to act as a Bronsted base.

If the molecule is a Bronsted base, then it can accept a proton ("H"^+)(H+).

Thus, if we add a hydrogen ion (a proton) to the ion, we get "H"_2"PO"_2^-H2PO−2.

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