Subscribers to REGULAR materials will notice that the old TOPIC 15 materials (formerly Acids & Bases) have now been re-designated as TOPIC 14 in the new regular course. The old TOPIC 14 materials (Equilibrium) have been removed, since this TOPIC was not taught by me in the regular course in 08-09. See the Regular Course page for full details; https://adriandingleschemistrypages.com/regular.html