Here the amphoteric solvent, (H₂O) acts as an acid in the presence of a base and forms a hydroxide ion (OH⁻) by donating a proton. So NH₃ acts as a base and thereby accepts a proton to form its conjugate acid, that is ammonium ion (NH₄⁺). Hence the conjugate acid of NH₃ is NH₄⁺.
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