Why does nh3+ not have the same pka as nh3?

1 answer

NH3+ does not have the same pKa as NH3 because NH3+ is a conjugate acid of NH3. When NH3 acts as a base, it can accept a proton (H+) to form NH3+. This is a result of NH3+ having an additional proton compared to NH3. The addition of the proton changes the chemical properties and stability of the molecule, resulting in a different pKa value.