Citation:
A conjugate base is the species that remains after an acid has donated a proton (H+ ion) during a chemical reaction. It is capable of gaining a proton in the reverse reaction, forming the original acid.
An acid is a substance that donates protons (H+ ions) in a chemical reaction.
A base is a substance that accepts protons (H+ ions) during a chemical reaction.
Brønsted: Lowry Theory - This theory defines acids as proton donors and bases as proton acceptors in a chemical reaction