A conjugate acid is a substance formed when a base gains a proton. It is the species that is formed as a result of accepting a proton from a base. For example, in the reaction between ammonia (NH3) and a proton (H+), ammonia gains a proton to form its conjugate acid, ammonium (NH4+).
The conjugate acid of a base is always one proton higher in comparison to the original base. It will have a positive charge and will be more acidic than the base itself.
Conjugate acid
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