A Brønsted–Lowry base is a substance that can accept a proton (H+) from another substance. It acts as a proton acceptor in a chemical reaction involving acids and bases.
An acid is a substance that can donate a proton to another substance.
A conjugate acid is formed when a Brønsted–Lowry base gains a proton.
pH is a scale used to specify how acidic or basic (alkaline) an aqueous solution is