The correct statements regarding acids, bases, and their conjugate pairs are:
- When an acid donates a proton, a conjugate base remains.
- When a base accepts a proton, a conjugate acid remains.
So the first two statements you listed capture the accurate relationships:
- When an acid donates a proton, a conjugate base remains.
- When a base accepts a proton, a conjugate acid remains.
The other statements that mention a base donating a proton or an acid producing a conjugate acid are incorrect. In summary, the accurate description is that an acid upon donation of a proton forms its conjugate base, and a base upon acceptance of a proton forms its conjugate acid.