Problem: Which of the following represents a conjugate acid-base pair?A) H2PO4– and PO43–B) HNO3 and NO3-C) HCl and NaOHD) HSO4– and SO32–E) none of these

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We’re being asked which of the following represents a conjugate acid-base pair


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.


Inspecting each pair:

A) H2PO4 and PO43–

  • H2PO4 (as acid) → remove H→ conjugate base is HPO42-

Not a conjugate pair

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Problem Details

Which of the following represents a conjugate acid-base pair?

A) H2PO4 and PO43–

B) HNO3 and NO3-

C) HCl and NaOH

D) HSO4 and SO32–

E) none of these


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

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