Problem: What is a conjugate acid–base pair for the following equilibrium?H2O(l) + HPO42–(aq) ⇌ H2PO4–(aq) + OH–(aq)A) H2O is an acid and HPO42– is its conjugate base.B) HPO42– is an acid and OH– is its conjugate base.C) H2O is an acid and OH– is its conjugate base.D) HPO42– – is an acid and H2PO4– is its conjugate base.E) HPO42–  is an acid and H2O is its conjugate base.

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FREE Expert Solution

We’re being asked to determine the conjugate acid-base pair for the following equilibrium reaction:

H2O(l) + HPO42–(aq) ⇌ H2PO4(aq) + OH(aq)


Recall that the conjugate acid of a base is simply the compound formed when a base gains a hydronium ion (H+). It's considered as an acid because it can lose H+ to reform the base. 


On the other hand, 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.


H2O(l) + HPO42–(aq) ⇌ H2PO4(aq) + OH(aq)

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Problem Details

What is a conjugate acid–base pair for the following equilibrium?

H2O(l) + HPO42–(aq) ⇌ H2PO4(aq) + OH(aq)

A) H2O is an acid and HPO42– is its conjugate base.

B) HPO42– is an acid and OH is its conjugate base.

C) H2O is an acid and OH is its conjugate base.

D) HPO42– – is an acid and H2PO4 is its conjugate base.

E) HPO42–  is an acid and H2O is its conjugate base.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Conjugate Acids and Bases concept. If you need more Conjugate Acids and Bases practice, you can also practice Conjugate Acids and Bases practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Davis' class at UCF.