Question

Consider this reaction: NH4+ + HPO42− → NH3 + H2PO4−

Which is the conjugate base?

NH4+

NH3

HPO42–

H2PO4–

Answer 1

The NH3, as it was the acid in the beginning and donated a proton to become more basic.

Answer 2

The conjugate base is formed when an acid loses its hydrogen or proton. In the reaction between ammonium ion and hydrogen phosphate, HPO₄²⁻ is the conjugate base. Thus, option C is correct.

What is a conjugate base?

Conjugate bases are formed when the substance accepts or absorbs the proton or the hydrogen ion from the acids in the solution. It can be said as a base with an added hydrogen ion to it.

The chemical reaction of the acids and the bases has been shown as,

NH₄⁺ + HPO₄²⁻ → NH₃⁺ +  H₂PO₄⁻

From the reaction, it can be said that ammonia donated its proton, whereas HPO₄²⁻ accepted hydrogen ions from the acid.

Therefore, HPO₄²⁻ has been the conjugate base in the given chemical reaction.

Learn more about conjugate base here:

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