Identify conjugate acid-base pairs in the reaction H₂O + NH₃ ⇌ NH₄⁺ + OH⁻.
Chemical equation showing a reaction between H₂O and NH₃ forming NH₄⁺ and OH⁻, with labels for acid 1, base 1, acid 2, and base 2, and instructions to identify conjugate acid-base pairs.