How the ideas connect
A good science page should make the connection visible, not just list definitions.
pH, acids and bases
pH is a logarithmic way of expressing hydrogen-ion activity; introductory calculations often approximate activity using concentration in sufficiently dilute solutions.
Because the scale is logarithmic, a change of one pH unit corresponds to a tenfold change in the relevant hydrogen-ion activity ratio.
Ions
An ion is an atom or molecular entity carrying a net electric charge because its numbers of protons and electrons are not balanced.
Losing electrons gives a positive charge; gaining electrons gives a negative charge. This simple bookkeeping is behind salts, electrochemistry and much of solution chemistry.
Chemical equilibrium
At chemical equilibrium, forward and reverse processes continue but their rates are equal, so macroscopic composition no longer changes with time. Equilibrium is dynamic, not a frozen reaction.
That single idea prevents one of the most common misunderstandings in chemistry.
What to notice
A good science page should make the connection visible, not just list definitions.
Sources
IUPAC Gold Book · NIST · BIPM