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The ammonium ion is formed when ammonia accepts a proton from an acid.

What is conjugate acid?

The term conjugate acid  refers to a specie that is formed when a base accepts a proton. The conjugate acid of ammonia is the ammonium ion.

This is because, the ammonium ion is formed when ammonia accepts a proton from an acid.

Learn more about conjugate acid: https://brainly.com/question/12883745